Scholars@Duke
Manolis Veveakis

Manolis Veveakis CV

Professor in the Department of Civil and Environmental Engineering
Civil and Environmental Engineering
CV

Selected Publications

Solutions and case studies for thermally driven reactive transport and porosity evolution in geothermal systems (reactive Lauwerier problem)

Journal Article Hydrology and Earth System Sciences · October 23, 2024 Subsurface non-isothermal fluid injection is a ubiquitous scenario in energy and water resource applications, which can lead to geochemical disequilibrium and thermally driven solubility changes and reactions. Depending on the nature of the solubility of a ... Full text Cite

In memoriam of Patrick Selvadurai

Journal Article Geomechanics for Energy and the Environment · June 1, 2024 Full text Cite

A Phase-Field Discrete Element Method to study chemo-mechanical coupling in granular materials

Journal Article Computer Methods in Applied Mechanics and Engineering · May 1, 2024 This paper presents an extension of the discrete element method using a phase-field formulation to incorporate grain shape and its evolution. The introduction of a phase variable enables an effective representation of grain geometry and facilitates the app ... Full text Cite

Frictional weakening of a granular sheared layer due to viscous rolling revealed by discrete element modeling

Journal Article Granular Matter · May 1, 2024 Considering a 3D sheared granular layer through a discrete element modeling, it is well known the rolling resistance influences the macro friction coefficient. Even if the rolling resistance role has been deeply investigated previously because it is common ... Full text Cite

Slow Slip Events in New Zealand: Irregular, yet Predictable?

Journal Article Geophysical Research Letters · March 28, 2024 Current earthquake forecasting approaches are mainly based on probabilistic assumptions, as earthquakes seem to occur randomly. Such apparent randomness can however be caused by deterministic chaos, rendering deterministic short-term forecasts possible. Du ... Full text Cite

Temperature dependence of soil-structure interface behaviour in the context of thermally-activated piles: A review

Journal Article Geomechanics for Energy and the Environment · March 1, 2024 Thermally-activated (TA) piles are cost-effective technologies with the dual role of transferring structural loads to the ground while exchanging heat with the surrounding soil as part of shallow geothermal energy systems. As TA piles are subjected to both ... Full text Cite

A two-scale study on the influence of biopolymer enhancement on drying granular materials

Journal Article Geotechnique Letters · February 26, 2024 Cracking resulting from drying (constrained dehydration) poses a significant challenge in geomaterials, impacting their mechanical performance. To address this problem, extensive efforts have been made to prevent or mitigate the occurrence of cracks, with ... Full text Cite

Prediction and demonstration of periodic tensile cracking in rate-dependent porous cement

Journal Article International Journal of Solids and Structures · December 15, 2023 Periodic tensile cracks are shown to occur when cylinder-shaped saturated cement specimens are subjected to rapid decompression, with the spacing between the cracks scaling as a power law of the decompression time. This behavior is predicted by theory, whi ... Full text Cite

Landslide susceptibility evaluation in Alpine environment: 1. 3D Finite Element modeling of the Ruinon (IT) case study

Journal Article Geomechanics for Energy and the Environment · December 1, 2023 This manuscript is Part 1 of two companion papers that explore a multidisciplinary approach to predict velocity and stability of a large landslide located in the Central Italian Alps: the Ruinon landslide. The area is of high geological interest due to the ... Full text Cite

Landslide susceptibility evaluation in Alpine environment: 2. Thermo-hydro-mechanical modeling for the response to climate-related variables

Journal Article Geomechanics for Energy and the Environment · December 1, 2023 This paper is Part 2 of two companion papers, proposing a multidisciplinary approach to assess stability and velocity evolution of a large landslide located in the Central Italian Alps (upper Valtellina region): the Ruinon landslide. Part 1 of this work pr ... Full text Cite

The physics of desiccation cracks 2: Modeling and prediction of the crack patterns

Journal Article Geomechanics for Energy and the Environment · September 1, 2023 This paper extends the experimental results of our companion paper by modeling and predicting the onset and pattern formation of desiccation cracks in geomaterials (Ruoyu et al., 2023). Thin-layer silt samples in controlled atmospheric conditions were test ... Full text Cite

The physics of desiccation cracks 1: Ductile fracturing and dependence on relative humidity

Journal Article Geomechanics for Energy and the Environment · September 1, 2023 Ductile deformation is ubiquitously found in the shrinkage of geomaterials. The existence of ductility requires elastoplastic mechanics when analyzing the structure deformation under external stress. In this work, we explore the physics of ductile fracturi ... Full text Cite

Finite Element Continuation Analysis for Cnoidal Waves in Solids

Chapter · January 1, 2023 Under compression, rate-dependent solids subject to hydro-mechanical processes have been shown to accommodate singular cnoidal wave solutions [1], as a material instability at the stationary wave limit. Given the numerical complexity to solve the correspon ... Full text Cite

An Experimental Study on Silt Desiccation Cracking with Different Basal Constraints and Various Humidity

Conference Springer Series in Geomechanics and Geoengineering · January 1, 2023 This paper presents the desiccation failure process of geomaterials under controlled environmental conditions. The experiment material, granite powder silt, was tested in a controlled atmospheric chamber that ensures temperature consistency and provides hu ... Full text Cite

Predicting the Yield Stress of Geomaterials from Their Microstructure

Conference Springer Series in Geomechanics and Geoengineering · January 1, 2023 The seminal work of Gurson (J Eng Mater Technol 99:2–5, 1977) on a simplified pore structure, a single spherical pore, first provided a theoretical relationship between the yield stress and the porosity. This contribution extends the approach to determine ... Full text Cite

Forecasting and mitigating landslide collapse by fusing physics-based and data-driven approaches

Journal Article Geomechanics for Energy and the Environment · December 1, 2022 Deep-seated landslides represent one of the most devastating natural hazards on earth, typically creeping at inappreciable velocities over several years before collapsing at catastrophic speeds. They can have detrimental consequences to society, causing fa ... Full text Cite

Thermo-poromechanics of chemically active faults-enriching Anderson's theory of faulting in sedimentary rocks

Journal Article Geophysical Journal International · November 1, 2022 A suggested model to explain the episodic nature of slow earthquakes involves shear zones exhibiting rate-and temperature-dependent frictional behaviour hosting fluid-release chemical reactions. In this work we extend the considerations of that approach, c ... Full text Cite

The Brittle–Ductile Transition and the Formation of Compaction Bands in the Savonnières Limestone: Impact of the Stress and Pore Fluid

Journal Article Rock Mechanics and Rock Engineering · November 1, 2022 Carbonate sediments play a prominent role on the global geological stage as they store more than 60 % of world’s oil and 40 % of world’s gas reserves. Prediction of the deformation and failure of porous carbonates is, therefore, essential to minimise reser ... Full text Cite

Capillary Water in 2-D Drying—Cracking Sub-Grain Scale Soil Models: Dynamics and Instabilities of Haines Jumps

Journal Article Water Resources Research · November 1, 2022 Changes in capillary water morphology in a cluster of three wet long cylindrical grains as reported in Mielniczuk and Hueckel (2022, https://doi.org/10.1029/2022wr031938) affect capillary forces evolving during drying. The paper focuses on a stable motion ... Full text Cite

Influence of cementation on the yield surface of rocks numerically determined from digital microstructures

Journal Article International Journal of Plasticity · September 1, 2022 Digital Rock Physics has reached a level of maturity on the characterisation of primary properties that depend on the microstructure - such as porosity, permeability or elastic moduli - by numerically solving field equations on μCT scan images of rock. Aft ... Full text Cite

Life Expectancy of Evaporating Capillary Bridges Predicted by Tertiary Creep Modeling

Journal Article Frontiers in Mechanical Engineering · April 7, 2022 The evaporation of capillary bridges is experimentally investigated at the microscale through a three-grain capillary cluster. This setting provides the minimum viable description of Haines jumps during evaporation, that is, capillary instabilities stemmin ... Full text Cite

Effect of grain size distribution on the shear band thickness evolution in sand

Journal Article Geotechnique · April 1, 2022 Triaxial experiments were conducted on granular materials presenting uniform, graded and fractal particle distributions in order to investigate how the broadness of the distribution affects the phenomenon of strain localisation. The shear band thickness ev ... Full text Cite

Morphometric description of strength and degradation in porous media

Journal Article International Journal of Solids and Structures · April 1, 2022 The influence of the microstructural geometry on the behavior of porous media is widely recognized, particularly in geomaterials, but also in biomaterials and engineered materials. Recent advances in imaging techniques, such as X-ray microcomputed tomograp ... Full text Cite

The influence of anisotropy on compaction bands: The case of coaxiality between stress and fabric anisotropy tensors

Journal Article International Journal for Numerical and Analytical Methods in Geomechanics · January 1, 2022 Compaction bands are localized failure patterns that appear in highly porous rock material under the effect of relatively high confining pressure. Being affected mainly by volumetric compression, these bands appear to be almost perpendicular to the most co ... Full text Cite

Continuous assessment of landslides by measuring their basal temperature

Journal Article Landslides · December 1, 2021 In this study, we suggest a temperature-based assessment and mitigation approach for deep-seated landslides that allows to forecast the behavior of the slide and assess its stability. The suggested approach is validated through combined field monitoring an ... Full text Cite

Automatically adaptive stabilized finite elements and continuation analysis for compaction banding in geomaterials

Journal Article International Journal for Numerical Methods in Engineering · November 15, 2021 Under compressive creep, viscoplastic solids experiencing internal mass transfer processes can accommodate singular cnoidal wave solutions as material instabilities at the stationary wave limit. These instabilities appear when the loading rate is significa ... Full text Cite

Predicting the yield strength of a 3D printed porous material from its internal geometry

Journal Article Additive Manufacturing · August 1, 2021 The design of any manufactured material requires the knowledge of its limit of elasticity, called yield strength. Whilst laboratory experiments are currently necessary to do so, this study is part of initiatives which aim at deriving the strength value fro ... Full text Cite

A blended transient/quasistatic Lagrangian framework for salt tectonics simulations with stabilized tetrahedral finite elements

Journal Article International Journal for Numerical Methods in Engineering · July 30, 2021 We propose a Lagrangian solid mechanics framework for the simulation of salt tectonics and other large-deformation geomechanics problems at the basin scale. Our approach relies on general elastic-viscoplastic constitutive models to characterize the deforma ... Full text Cite

Strain localization regularization and patterns formation in rate-dependent plastic materials with multiphysics coupling

Journal Article Journal of the Mechanics and Physics of Solids · July 1, 2021 Strain localization is an instability phenomenon occurring in deformable solid materials which undergo dissipative deformation mechanisms. Such instability is characterized by the localization of the displacement or velocity fields in a zone of finite thic ... Full text Cite

Influence of dissolution on long-term frictional properties of carbonate fault gouge

Journal Article Geomechanics for Energy and the Environment · June 1, 2021 Velocity stepping experiments have been performed on a simulated calcite gouge using an annular shear apparatus to investigate the effect of dissolution on the frictional properties of a carbonate fault. The tested material was put in contact with hydrochl ... Full text Cite

A note on the instability and pattern formation of shrinkage cracks in viscoplastic soils

Journal Article Geomechanics for Energy and the Environment · March 1, 2021 In this note we present a theoretical study on the conditions for the onset of cracks, as well as the corresponding pattern formation, in saturated viscoplastic soils under isotropic loading (extension). The type of stress applied is left unspecified, to c ... Full text Cite

The interplay between phyllosilicates fabric and mechanical response of deep-seated landslides. The case of El Forn de Canillo landslide (Andorra)

Journal Article Landslides · January 1, 2021 Deep-seated landslides are among the most devastating natural hazards on earth, usually involving a rigid rock mass sliding over a weak, clayey shear band rich in phyllosilicates. The mechanical response of this shear band to the loading of the overburden ... Full text Cite

Analysis of Instabilities in Faults

Chapter · January 1, 2021 In this chapter, the authors are interested in modeling the creation of shear bands within a fault zone by taking into account the influence of the characteristic size of the microstructure through Cosserat continuum theory together with thermo-hydro-mecha ... Full text Cite

On the Thermo-poro-mechanics of Chemically Active Faults

Chapter · January 1, 2021 This chapter summarizes a theory that couples the solid and fluid-like behavior. This theory must be able to provide the framework for modeling both the formation of faults and their postfailure evolution. The chapter shows that the formation and postfailu ... Full text Cite

Viscous phase-field modeling for chemo-mechanical microstructural evolution: application to geomaterials and pressure solution

Journal Article International Journal of Solids and Structures · December 15, 2020 The microstructural geometry of materials has a significant influence on their macroscopic response, especially when the process is essentially microscopic as for chemo-mechanical processes. In this work, we are pursuing the idea that interface-tracking mo ... Full text Cite

Fault reactivation during fluid production, modelled as a multi-physics multi-scale instability

Conference E3s Web of Conferences · November 18, 2020 During fluid production in carbonate reservoir rock under high Pressure and Temperature conditions, the production-enhanced shear-heating of a creeping fault can lead to a thermal run-away. The reactivation of the fault is then accompanied with a large inc ... Full text Cite

Permeability Hysteresis From Microchannels Opening During Dissolution/Reprecipitation Cycle

Journal Article Geophysical Research Letters · September 28, 2020 Permeability is a critical parameter for geological resources characterization. Its evolution with respect to porosity is particularly interesting and many research initiatives focus on deriving such relationships, to understand some hydraulic impacts of m ... Full text Cite

Adaptive stabilized finite elements: Continuation analysis of compaction banding in geomaterials

Journal Article · August 4, 2020 Under compressive creep, visco-plastic solids experiencing internal mass transfer processes have been recently proposed to accommodate singular cnoidal wave solutions, as material instabilities at the stationary wave limit. These instabilities appear when ... Link to item Cite

On the Stability of Deep-Seated Landslides. The Cases of Vaiont (Italy) and Shuping (Three Gorges Dam, China)

Journal Article Journal of Geophysical Research Earth Surface · July 1, 2020 Deep-seated landslides can have catastrophic impacts on human life and infrastructure when they suddenly fail. These events are devastating because of the large volumes of soil and rock masses involved and their often long runout. The present study suggest ... Full text Cite

Three-scale multiphysics finite element framework (FE3) modelling fault reactivation

Journal Article Computer Methods in Applied Mechanics and Engineering · June 15, 2020 Fluid injection or production in petroleum reservoirs affects the reservoir stresses such that it can even sometime reactivate dormant faults in the vicinity. In the particular case of deep carbonate reservoirs, faults can also be chemically active and che ... Full text Cite

A visco-plastic framework for interface processes in sedimentary reservoir rocks at HPHT conditions

Journal Article Geomechanics for Energy and the Environment · May 1, 2020 As energy operations face the challenge of reservoirs at ever-increasing depths, modelling the response of reservoir rocks at high pressure and high temperature (HPHT) conditions is a crucial step for successfully unlocking new resources. At these conditio ... Full text Cite

A heuristic model inversion for coupled thermo-hydro-mechanical modelling of triaxial experiments

Journal Article Computers and Geotechnics · January 1, 2020 As multiphysics geomechanical models get developed, their increasing complexity and number of parameters make it particularly difficult to calibrate against experimental data. In this contribution, we present a heuristic workflow to invert for parameters o ... Full text Cite

Weak phases production and heat generation control fault friction during seismic slip.

Journal Article Nature communications · January 2020 The triggering and magnitude of earthquakes is determined by the friction evolution along faults. Experimental results have revealed a drastic decrease of the friction coefficient for velocities close to the maximum seismic one, independently of the materi ... Full text Cite

Influence of stress field anisotropy on drilling-induced tensile fracture

Journal Article Environmental Geotechnics · January 1, 2020 Drilling-induced tensile fracture under anisotropic stress conditions is investigated numerically with an elasto-viscoplastic constitutive model, in which the plastic strain rate can be decomposed into deviatoric and volumetric components. Both the deviato ... Full text Cite

Observation of strain localization by digital image correlation to study the influence of particle size distribution

Conference 54th U S Rock Mechanics Geomechanics Symposium · January 1, 2020 Strain localization is a pervasive phenomenon observed in many materials and characterized by a loss of homogeneity of the field of deformation. In the particular case of geomaterials, this feature often occurs in the form of shear bands observed on outcro ... Cite

A thermo-chemo-mechanical model for fault friction

Conference 54th U S Rock Mechanics Geomechanics Symposium · January 1, 2020 A substantial decrease of the apparent friction has been observed in many experiments performed on synthetic or recovered fault gouges or bare rocks at seismic slip rates for different materials. This phenomenon has major implications to understand the cre ... Cite

Review for gmd-2018-341

Journal Article · May 15, 2019 Full text Cite

Pressure equilibration induced by reactivation of deep carbonate faults

Conference 5th International Conference on Fault and Top Seals 2019 · January 1, 2019 © 5th International Conference on Fault and Top Seals 2019. All Rights Reserved. Fluid production is known to induce stress changes in the reservoir that can be large enough to reactivate nearby dormant faults. Interestingly, following the reactivation of ... Cite

Pressure equilibration induced by reactivation of deep carbonate faults

Conference 5th International Conference on Fault and Top Seals 2019 · January 1, 2019 © 5th International Conference on Fault and Top Seals 2019. All Rights Reserved. Fluid production is known to induce stress changes in the reservoir that can be large enough to reactivate nearby dormant faults. Interestingly, following the reactivation of ... Cite

Pressure equilibration induced by reactivation of deep carbonate faults

Conference 5th International Conference on Fault and Top Seals 2019 · January 1, 2019 Fluid production is known to induce stress changes in the reservoir that can be large enough to reactivate nearby dormant faults. Interestingly, following the reactivation of a fault, fluid pressure equilibration between the two sides of the fault can some ... Full text Cite

Dynamic stability threshold of thermally sensitive creeping landslides

Conference Proceedings of the International Conference on Natural Hazards and Infrastructure · January 1, 2019 The problem of creeping landslides accompanied by heat production due to friction on their base (hereinafter called thermally driven slides) is studied in this paper. The landslide is modeled using a rigid block that slides over a clayey zone of finite wid ... Cite

Next Generation Reservoir Engineering

Journal Article ASEG Extended Abstracts · December 2018 Full text Cite

Episodic mineralising fluid injection through chemical shear zones

Journal Article ASEG Extended Abstracts · December 2018 Full text Cite

The dynamics of multiscale, multiphysics faults: Part I - The long-term behaviour of the lithosphere

Journal Article Tectonophysics · October 30, 2018 Here we used a physics-based geomechanics approach to show that the long-term strength of the lithosphere is controlled by multiple steady states that arise as a function of significant material weakening at and above a critical value of local dissipation. ... Full text Cite

The dynamics of multiscale, multiphysics faults: Part II - Episodic stick-slip can turn the jelly sandwich into a crème brûlée

Journal Article Tectonophysics · October 30, 2018 Incorporating coupled Thermal-Hydro-Mechanical-Chemical (THMC) processes in lithospheric deformation models is a research frontier in the study of lithosphere dynamics. In this study we present a fundamental theoretical analysis on the important lithospher ... Full text Cite

Numerical Analysis of Strain Localization in Rocks with Thermo-hydro-mechanical Couplings Using Cosserat Continuum

Journal Article Rock Mechanics and Rock Engineering · October 1, 2018 A numerical model for thermo-hydro-mechanical strong couplings in an elasto-plastic Cosserat continuum is developed to explore the influence of frictional heating and thermal pore fluid pressurization on the strain localization phenomenon. This model allow ... Full text Cite

The importance of Thermo-Hydro-Mechanical couplings and microstructure to strain localization in 3D continua with application to seismic faults. Part II: Numerical implementation and post-bifurcation analysis

Journal Article Journal of the Mechanics and Physics of Solids · June 1, 2018 In this paper we study the phenomenon of localization of deformation in fault gouges during seismic slip. This process is of key importance to understand frictional heating and energy budget during an earthquake. A infinite layer of fault gouge is modeled ... Full text Cite

Computational upscaling of Drucker-Prager plasticity from micro-CT images of synthetic porous rock

Journal Article Geophysical Journal International · January 1, 2018 Quantifying rock physical properties is essential for the mining and petroleum industry. Microtomography provides a new way to quantify the relationship between the microstructure and the mechanical and transport properties of a rock. Studies reporting the ... Full text Cite

Leveraging supercritical CO2 to rejuvenate hydraulically fractured wells in unconventional reservoirs

Conference Society of Petroleum Engineers SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition 2018 Sats 2018 · January 1, 2018 It is not uncommon that wells drilled in shale reservoirs experience a large Initial Production (IP), followed by a significant drop in productivity a few months after hydraulic fracturing, leading to a reduced Estimated Ultimate Recovery (EUR), with prima ... Cite

Modelling fluid-microstructure interaction on elasto-visco-plastic digital rocks

Journal Article Geomechanics for Energy and the Environment · December 1, 2017 Flow simulators have become increasingly popular to compute permeability on digital porous rocks reconstructed from Computerised Tomography (CT) scan data as part of Digital Rock Physics workflows. Various schemes are being used that focus mainly on numeri ... Full text Cite

The Role of Temperature in Shear Instability and Bifurcation of Internally Pressurized Deep Boreholes

Journal Article Rock Mechanics and Rock Engineering · November 1, 2017 This paper investigates localized shear deformation around a borehole due to internal pressure in the well such as by fluid injection. Using an elasto-visco-plastic formulation combined with damage mechanics for the effect of shear cracking, we first bench ... Full text Cite

Zebra rocks: compaction waves create ore deposits.

Journal Article Scientific reports · October 2017 Nature has a range of distinct mechanisms that cause initially heterogeneous systems to break their symmetry and form patterns. One of these patterns is zebra dolomite that is frequently hosting economically important base metal mineralization. A consisten ... Full text Cite

Multiscale assessment of micro-seismicity and slow earthquakes

Journal Article Physics of the Earth and Planetary Interiors · March 1, 2017 Full text Cite

A Framework for Fracture Network Formation in Overpressurised Impermeable Shale: Deformability Versus Diagenesis

Journal Article Rock Mechanics and Rock Engineering · March 1, 2017 Understanding the formation, geometry and fluid connectivity of nominally impermeable unconventional shale gas and oil reservoirs is crucial for safe unlocking of these vast energy resources. We present a recent discovery of volumetric instabilities of duc ... Full text Cite

Multi-Physics Modelling of Fault Mechanics Using REDBACK: A Parallel Open-Source Simulator for Tightly Coupled Problems

Journal Article Rock Mechanics and Rock Engineering · March 1, 2017 Faults play a major role in many economically and environmentally important geological systems, ranging from impermeable seals in petroleum reservoirs to fluid pathways in ore-forming hydrothermal systems. Their behavior is therefore widely studied and fau ... Full text Cite

Episodic Tremor and Slip (ETS) as a chaotic multiphysics spring

Journal Article Physics of the Earth and Planetary Interiors · March 1, 2017 Episodic Tremor and Slip (ETS) events display a rich behaviour of slow and accelerated slip with simple oscillatory to complicated chaotic time series. It is commonly believed that the fast events appearing as non volcanic tremors are signatures of deep fl ... Full text Cite

Localisation of deformation for shearing of a fault gouge with cosserat microstructure and different couplings

Chapter · January 1, 2017 In this paper, we show the impact of Thermo-Hydro Mechanical couplings (THM) on the stability of a saturated fault gouge under shear. By resorting to Cosserat continuum mechanics, that allows to take into account rotational degrees of freedom, we regulariz ... Full text Cite

The effect of rotational and isotropic hardening on the onset of compaction bands

Chapter · January 1, 2017 Compaction bands are localized failure patterns that appear in highly porous rock material under the effect of relatively high confining pressure. Being affected mainly by volumetric compression, these bands appear to be almost perpendicular to the most co ... Full text Cite

Framework for multiscale flow simulation of deformable rocks

Chapter · January 1, 2017 A Finite Element implementation is presented to solve for Stokes flow on a deformable rock matrix reconstituted from a stack of computerized tomography images. Tightly coupling this flow solution with a mechanical deformation model exhibits the hydro-mecha ... Full text Cite

An inversion framework for numerical modelling of pore collapse in soft porous rocks

Chapter · January 1, 2017 In this work we present an inversion framework to identify material properties defining the plastic behaviour of pore collapse modeled by thermo-hydro-mechanical simulations. This framework is built on the finite element REDBACK numerical simulator, which ... Full text Cite

Thermo-hydro-mechanics in shear fracturing in geothermal reservoirs

Chapter · January 1, 2017 This paper presents a novel method to investigate shear stimulation at an injection well in Enhanced Geothermal Systems (EGS). Nowadays, the technique of EGS has been extensively used for extracting thermal energy from the earth. As the intrinsic permeabil ... Full text Cite

Bifurcation criteria for strain localization in multiphysical systems

Chapter · January 1, 2017 The study of bifurcation criteria for non-isothermal processes in geomaterials requires approaches that deviate from the classical material bifurcation approach. Indeed, in a quasi-static stress state of the medium, the admissible equilibria are of steady- ... Full text Cite

Shear heating in creeping faults changes the onset of convection

Journal Article Geophysical Journal International · January 1, 2017 The interaction between mechanical deformation of creeping faults and fluid flow in porous media has an important influence on the heat and mass transfer processes in Earth sciences. Creeping faults can act as heat sources due to the effect of shear heatin ... Full text Cite

Total porosity of tight rocks: A welcome to the heat transfer technique

Journal Article Energy and Fuels · December 15, 2016 Total rock porosity is a key parameter in a wide range of disciplines from petroleum to civil and mining engineering. Porosity is particularly important in petroleum engineering applications, e.g., from estimation of hydrocarbon in place to prediction of g ... Full text Cite

Analysis of dynamics in multiphysics modelling of active faults

Journal Article Mathematics · December 1, 2016 Instabilities in Geomechanics appear on multiple scales involving multiple physical processes. They appear often as planar features of localised deformation (faults), which can be relatively stable creep or display rich dynamics, sometimes culminating in e ... Full text Cite

Dissipative propagation of pressure waves along the slip-lines of yielding material

Journal Article International Journal of Engineering Science · October 1, 2016 Traditional slip-line field theory considers steady-state pressure distributions. This work examines the evolution of pressure at yield. We show that, for a two phase material in plane strain at the point of plastic yield of the main constituent, pressure ... Full text Cite

Boudinage and folding as an energy instability in ductile deformation

Journal Article Journal of Geophysical Research Solid Earth · May 1, 2016 We present a theory for the onset of localization in layered rate- and temperature-sensitive rocks, in which energy-related mechanical bifurcations lead to localized dissipation patterns in the transient deformation regime. The implementation of the couple ... Full text Cite

A viscoplastic approach for pore collapse in saturated soft rocks using REDBACK: An open-source parallel simulator for Rock mEchanics with Dissipative feedBACKs

Journal Article Computers and Geotechnics · April 1, 2016 Numerical simulators have become indispensable in geomechanics to model increasingly more complex rock behaviours by harnessing the growing computational power available. Those tools aim at simulating more realistic scenarios while accounting for more phys ... Full text Cite

Conditions for the localisation of plastic deformation in temperature sensitive viscoplastic materials

Journal Article Journal of Mechanics of Materials and Structures · January 1, 2016 We study the onset of localisation of plastic deformation for a class of materials that exhibit both temperature and rate sensitivity. The onset of localisation is determined via an energy bifurcation criterion, defined by the postulate that viscoplastic m ... Full text Cite

A novel wave-mechanics approach for fluid flow in unconventional resources

Journal Article Leading Edge · January 1, 2016 A novel wave-mechanics approach is developed specifically for understanding instabilities that form large natural fluidtransmissivity networks in unconventional reservoirs located in a nominally impermeable matrix. Thse natural flow networks are trapped in ... Full text Cite

Multiscale, multiphysics geomechanics for geodynamics applied to buckling instabilities in the middle of the Australian craton

Journal Article Philosophical Magazine · October 23, 2015 We propose a new multi-physics, multi-scale Integrated Computational Materials Engineering framework for predictive geodynamic simulations. A first multiscale application is presented that allows linking our existing advanced material characterization meth ... Full text Cite

Modelling the Complexity of Continental Breakup and Basin Formation Including the Role of Magmatism

Conference International Conference and Exhibition, Melbourne, Australia 13-16 September 2015 · September 16, 2015 Full text Cite

Boudinage as a material instability of elasto-visco-plastic rocks

Journal Article Journal of Structural Geology · September 1, 2015 Pinch-and-swell structures are commonly interpreted to evolve out of viscosity contrasts, which are induced by geometric interactions and material imperfections. From materials science an additional localization phenomenon is well established, where locali ... Full text Cite

Compaction-driven melt segregation in migmatites

Journal Article Geology · April 24, 2015 A common and puzzling feature of migmatite terranes is the presence of synkinematic leucosomes oriented perpendicular to the maximum principal compressive stress axis, σ1, particularly leucosomes oriented parallel to the axial plane of folds. Th ... Full text Cite

Deep geothermal: The ‘Moon Landing’ mission in the unconventional energy and minerals space

Journal Article Journal of Earth Science · February 1, 2015 Deep geothermal from the hot crystalline basement has remained an unsolved frontier for the geothermal industry for the past 30 years. This poses the challenge for developing a new unconventional geomechanics approach to stimulate such reservoirs. While a ... Full text Cite

Review of extremum postulates

Journal Article Current Opinion in Chemical Engineering · January 1, 2015 Variational principles applied to the time derivative of the second law of thermodynamics have led to significant progress of our understanding of dynamic systems. Prigogine proved that chemical species dynamically form an oscillatory pattern of minimum of ... Full text Cite

Cnoidal waves in solids Dedicated to Professor Ioannis Vardoulakis

Journal Article Journal of the Mechanics and Physics of Solids · January 1, 2015 Cnoidal waves are nonlinear and exact periodic stationary waves, well known in the shallow water theory of fluid mechanics. In this study we retrieve such periodic stationary wave solutions as singularities of the problem of homogeneous volumetric deformat ... Full text Cite

The Fluid Dynamics of Solid Mechanical Shear Zones

Journal Article Pure and Applied Geophysics · November 6, 2014 Shear zones in outcrops and core drillings on active faults commonly reveal two scales of localization, with centimeter to tens of meters thick deformation zones embedding much narrower zones of mm-scale to cm-scale. The narrow zones are often attributed t ... Full text Cite

Modeling episodic fluid-release events in the ductile carbonates of the Glarus thrust

Journal Article Geophysical Research Letters · October 28, 2014 The exposed Glarus thrust displays midcrustal deformation with tens of kilometers of displacement on an ultrathin layer, the principal slip zone (PSZ). Geological observations indicate that this structure resulted from repeated stick-slip events in the pre ... Full text Cite

Thermo-poro-mechanics of chemically active creeping faults: 3. the role of serpentinite in episodic tremor and slip sequences, and transition to chaos

Journal Article Journal of Geophysical Research Solid Earth · June 1, 2014 During the last decade, knowledge over episodic tremor and slip (ETS) events has increased dramatically owing to the widespread installation of GPS and seismic networks. The most puzzling observations are (i) the periodic nature of slow seismic events, (ii ... Full text Cite

Thermo-poro-mechanics of chemically active creeping faults. 1: Theory and steady state considerations

Journal Article Journal of Geophysical Research Solid Earth · January 1, 2014 In this paper, we study the behavior of a fluid-saturated fault under shear, based on the assumption that the material inside exhibits rate- and temperature-dependent frictional behavior. A creeping fault of this type can produce excess heat due to shear h ... Full text Cite

Ductile compaction of partially molten rocks: The effect of non-linear viscous rheology on instability and segregation

Journal Article Geophysical Journal International · January 1, 2014 The segregation of melt from a linear viscous matrix is traditionally described by McKenzie's compaction theory. This classical solution overlooks instabilities that arise when non-linear solid matrix behaviour is considered. Here we report a closed form 1 ... Full text Cite

Thermo-poro-mechanics of chemically active creeping faults: 2. Transient considerations

Journal Article Journal of Geophysical Research Solid Earth · January 1, 2014 This work studies the transient behavior of a chemically active, fluid-saturated fault zone under shear. These fault zones are displaying a plethora of responses spanning from ultrafast instabilities, like thermal pressurization, to extremely slow creep lo ... Full text Cite

Failure in shear bands for granular materials: Thermo-hydro-chemo-mechanical effects

Journal Article Geotechnique Letters · November 19, 2013 The failure of geomaterials in localised shear bands is one of the most common features in geomechanics. Early studies have provided the necessary criteria for the conditions of localisation, inclination angle with respect to the loading axes and thickness ... Full text Cite

Multiscale coupling and multiphysics approaches in earth sciences: Applications

Journal Article Journal of Coupled Systems and Multiscale Dynamics · September 1, 2013 Full text Cite

Multiscale coupling and multiphysics approaches in earth sciences: Theory

Journal Article Journal of Coupled Systems and Multiscale Dynamics · April 1, 2013 Full text Cite

Modeling of fault gouges with Cosserat Continuum Mechanics: Influence of thermal pressurization and chemical decomposition as coseismic weakening mechanisms

Journal Article Journal of Structural Geology · May 1, 2012 In this paper we study the impact of thermal pressurization and mineral decomposition reactions under seismic deformation conditions (e.g., slip rates of about 1 m/s) triggered by shear heating, to the stability of a saturated fault material. By using high ... Full text Cite

A thermo-mechanical model for the catastrophic collapse of large landslides

Journal Article International Journal for Numerical and Analytical Methods in Geomechanics · October 10, 2011 In this work, a new thermo-mechanical model is developed, applicable to large-scale, deep-seated landslides consisting of a coherent mass sliding on a thin clayey layer. The considered time window is that of catastrophic acceleration, starting at incipient ... Full text Cite

Sliding and rolling dissipation in Cosserat plasticity

Journal Article Granular Matter · June 1, 2011 Based on micromechanical considerations at the level of grain contacts and taking into account the way in which kinematic and static quantities are introduced at grain surface and grain centre, we identify appropriate measures related to energy dissipation ... Full text Cite

Stability analysis of undrained adiabatic shearing of a rock layer with Cosserat microstructure

Journal Article Granular Matter · June 1, 2011 Stability of undrained shearing in a classical Cauchy continuum has been first analyzed by Rice (J Geophys Res 80(11):1531-1536, 1975) who showed that instability occurs when the underlying drained deformation becomes unstable (i.e. in the softening regime ... Full text Cite

Chemical reaction capping of thermal instabilities during shear of frictional faults

Journal Article Journal of the Mechanics and Physics of Solids · September 1, 2010 In this paper we study the behavior of thermo-viscoplastic fault materials under steady shear. It is shown that during creep and at lower temperatures, the rate- and thermally dependent friction laws most commonly used could present similar mathematical an ... Full text Cite

Thermoporomechanics of landslides: A review of the Vaiont slide

Journal Article European Journal of Environmental and Civil Engineering · January 1, 2010 The problem of creeping landslides accompanied by heat production due to friction on their base is studied here. The landslide is modelled using a rigid block that slides over a clayey zone of finite width and a thermal softening and velocity strengthening ... Full text Cite

Thermoporomechanics of landslides: A review of the vaiont slide

Journal Article European Journal of Environmental and Civil Engineering · January 1, 2010 The problem of creeping landslides accompanied by heat production due to friction on their base is studied here. The landslide is modelled using a rigid block that slides over a clayey zone of finite width and a thermal softening and velocity strengthening ... Full text Cite

Thermo-poro mechanical analysis of catastrophic landslides

Chapter · December 1, 2009 Catastrophic landslides are considered to slide dynamically under the presence of some weakening mechanism, like thermal pressurization, which reduces the strength of the slide near zero. In this study, based on energy considerations we model the run-off o ... Cite

Thermo-poro mechanical analysis of catastrophic landslides

Chapter · January 1, 2009 Catastrophic landslides are considered to slide dynamically under the presence of some weakening mechanism, like thermal pressurization, which reduces the strength of the slide near zero. In this study, based on energy considerations we model the run-off o ... Cite

Thermoporomechanics of creeping landslides: The 1963 Vaiont slide, northern Italy

Journal Article Journal of Geophysical Research Earth Surface · September 24, 2007 The catastrophic Vaiont landslide (Southern Alps, Italy) of 9 October 1963 moved 2.7 × 108 m3 of rock that collapsed in an artificial lake, causing a giant wave that killed 1917 people. The landslide was preceded by 2-3 years of creep ... Full text Cite