Micromechanics of compressive failure and spatial evolution of anisotropic damage in Darley Dale sandstone

Wu, Xiang; Baud, Patrick; Wong, Teng-fong

doi:10.1016/s1365-1609(99)00093-3

Cited by 164 publications

(123 citation statements)

References 33 publications

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“…Finally, widening of the shear-bands and diffusion of the strain may occur with persisting dilation or a transition to defuse compression, depending on the boundary conditions driving the deformation. The emerging progression in simulated shear bands is in agreement with theoretical predictions and experimental results (HAMIEL et al, 2005;LYAKHOVSKY and HAMIEL, 2007;BESUELLE, 2001;WU, 2000;ISSEN, 2008).…”

Section: Localized Dilation Within Shear-bands In Compression Testssupporting

confidence: 86%

“…Homogeneous compression and weak localization (or lack of it) in compression tests with high confining stress (i.e., [200 MPa and/or m & 0.2 and therefore n & n 0 ) are in agreement with experimental results (e.g., WONG et al, 1997;WU, 2000;MENENDEZ, 1996), with recent studies of compaction bands and compacting shear bands (CHALLA and ISSEN, 2004;ISSEN 2008) and with theoretical and numerical analysis of a coupled damage-porosity model (HAMIEL et al, 2004b(HAMIEL et al, , 2005. The conditions in which strain is not localized along shear-bands could represent a transition from brittle failure to distributed cataclastic flow in which compaction, pore collapse, strain-hardening and intensive grain crushing is dominant (WU 2000;MENENDEZ 1996). Alternatively, ISSEN (2008) suggest the formation of a localized compaction band could represent conditions in which the intermediate principal stress is equal to the minimum compressive stress.…”

Section: Localized Dilation Within Shear-bands In Compression Testssupporting

confidence: 86%

“…Alternatively, it could indicate that for non-porous rocks at relatively high confining pressure, pre-failure volumetric changes are small and highly depend on the stress state. Experimental and theoretic work with rocks of a large range of porosity indicate that while pre-failure damage is mostly intergranular cracking with limited or no dilatancy (depending on initial porosity and confinement), post-localization damage within the shear band is extensive and is associated with dilatancy and enhanced tensile stress at grain contacts (MENENDEZ, 1996;WU, 2000). Finally, some studies suggest that at moderate to high confining pressure, shear-induced dilation and inelastic compaction processes (e.g., distributed grain crushing and pore collapse) could coexist and interact to form compacting shear band and conjugate pure shear bands (CHALLA and ISSEN, 2004), or deformation in distinct domains of either dilating shear bands or arrays of compaction bands (BAUD et al, 2004).…”

Section: Localized Dilation Within Shear-bands In Compression Testsmentioning

confidence: 99%

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Shear Band Formation in Numerical Simulations Applying a Continuum Damage Rheology Model

Finzi

Mühlhaus

Gross

et al. 2012

Pure Appl. Geophys.

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Abstract-In seismically active regions, faults nucleate, propagate, and form networks that evolve over time. To simulate crustal faulting processes, including the evolution of fault-zone properties, a rheological model must incorporate concepts such as damage rheology that describe the various stages of the seismic cycle (strain localization, subcritical crack growth and macroscopic failure) while accounting for material degradation and healing and off-fault deformation. Here we study the fundamental patterns of strain-localisation within the framework of a continuum damage rheology by performing a shear band analysis (linear instability analysis) and comparing predictions of shear band orientations with numerical results of the nonlinear problem. We find (analytically and numerically) that the angle between the shear band and the less compressive (transverse) direction is between 47°in compression tests with a strain ratio of 0.25 (highly confined compression test), and 60°for a strain ratio higher than 1.4 (axial compression and transverse extension). In addition we find that shear bands exhibit local dilation (I 1 [ 0) in a wide range of strain ratios excluding only simulations with highly confined compression (which yield compacting shear bands or non-localized deformation). Finally, we discuss the applicability of the damage model for simulating deformation in the seismogenic, brittle crust.

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Section: Localized Dilation Within Shear-bands In Compression Testssupporting

confidence: 86%

Section: Localized Dilation Within Shear-bands In Compression Testssupporting

confidence: 86%

Section: Localized Dilation Within Shear-bands In Compression Testsmentioning

confidence: 99%

See 1 more Smart Citation

Shear Band Formation in Numerical Simulations Applying a Continuum Damage Rheology Model

Finzi

Mühlhaus

Gross

et al. 2012

Pure Appl. Geophys.

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“…Such damage processes in Berea and Darley Dale sandstones were documented by Menéndez et al (1996) and Wu et al (1999), respectively. Intragranular cracking dominates the hydrostatic and triaxial compaction processes.…”

Section: Strain Hardening and Spatial Evolution Of Damagementioning

confidence: 89%

Mechanical Compaction of Porous Sandstone

Wong

Baud

1999

Oil & Gas Science and Technology - Rev. IFP

102

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Résumé -Compaction mécanique des grès poreux -Pour de nombreux problèmes de tectonique et d'ingénierie de réservoir, la capacité à prévoir à la fois la fréquence, l'ampleur de la déformation inélas-tique et les ruptures repose sur une compréhension fondamentale de la phénoménologie et de la micromé-canique de compaction dans les roches-réservoirs. Cet article présente les résultats de recherches récentes sur la compaction mécanique des grès poreux. On insiste plus particulièrement sur la synthèse des données de laboratoire, la caractérisation microstructurale quantitative de l'endommagement, ainsi que sur les modèles théoriques basés sur un contact élastique et sur la mécanique de la rupture. Les attributs méca-niques de la compaction sur des échantillons initialement secs et saturés ont été étudiés sous des chargements hydrostatiques et non hydrostatiques dans une large gamme de pression. Les sujets spécifiques étu-diés ici incluent : la comparaison des données d'émission acoustique et mécanique avec une théorie de la plasticité ; le contrôle microstructural du début et du développement de la compaction ; l'écrouissage et l'évolution spatiale de l'endommagement lors de la compaction ; enfin, l'effet affaiblissant de l'eau sur le seuil de compaction et l'évolution de la porosité.Mots-clés : essais triaxiaux, porosité, émissions acoustiques, endommagement microstructural, compaction, dilatance. Abstract -Mechanical Compaction of Porous Sandstone -In many reservoir engineering and tectonic problems, the ability to predict both the occurrence and extent of inelastic deformation and failure hinges upon a fundamental understanding of the phenomenology and micromechanics of compaction in

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“…Both experience increased peak strength with subsequent reduction to the critical state line. Wu et al (2000) determined the onset of dilatancy inside the cementation yield surface for two different sandstones and found the onset of dilatancy to vary linearly with confining pressure. The The role of cementation in the behaviour of cemented soils Lade and Trads best-fit line was parallel-shifted to intersect the q-axis, resulting in increased contraction (compared with sand) before the onset of dilatancy.…”

Section: Stress-strain and Volume Change Behaviourmentioning

confidence: 99%

The role of cementation in the behaviour of cemented soils

Lade

Trads

2014

Geotechnical Research

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111The behaviour of cemented soil and the role of cementation are reviewed based on experimental results. The review is presented in terms of geomechanics concepts in which the cemented soil may be modelled by elasticity and hardening plasticity concepts. No modelling equations are given, but the observed behaviour is analysed in view of the components entering into an elastoplastic model. These consist of an elastic range in stress space in which energy is not created or expended, a cementation yield surface, a 3D failure surface, a plastic potential, a yield surface and the associated plastic hardening law.

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Micromechanics of compressive failure and spatial evolution of anisotropic damage in Darley Dale sandstone

Cited by 164 publications

References 33 publications

Shear Band Formation in Numerical Simulations Applying a Continuum Damage Rheology Model

Shear Band Formation in Numerical Simulations Applying a Continuum Damage Rheology Model

Mechanical Compaction of Porous Sandstone

The role of cementation in the behaviour of cemented soils

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