Compactive Deformation of Sandstone Under Crustal Pressure and Temperature Conditions

Jefferd, Mark; Brantut, Nicolas; Meredith, P. G.; Mitchell, Thomas M.; Plümper, Oliver

doi:10.1029/2020jb020202

Cited by 8 publications

(5 citation statements)

References 58 publications

(135 reference statements)

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“…In siliclastics, Jefferd et al. (2021) showed that the pressure of the brittle to ductile transition decreases from 20°C to 150°C in water‐saturated sandstone which they attributed to enhanced cataclastic pore collapse, a conclusion consistent with the observation that cataclasis is prevalent in siliclastic rocks at low temperatures. This is similar to our conclusion in the Solnhofen limestone but more expected as cataclastic pore collapse operates under dry conditions in sandstones as well (Wong et al., 1997).…”

Section: Discussionmentioning

confidence: 63%

“…(2017) saw no measurable effect of temperature on K IC in dry calcite. The effect of temperature under water‐saturated conditions is unknown, but (Jefferd et al., 2021) a 2%–3% reduction in K IC in sandstone between 20°C and 150°C, which explained water weakening of the peak strength. Thus the effect may be small but non‐negligible in calcite as well.…”

Section: Discussionmentioning

confidence: 99%

“…The mode of deformation, including the degree to which deformation is strain weakening and localized or strain hardening and distributed, is particularly important for controlling the strength, distribution of deformation, and permeability structure of the upper crust and plate boundary fault zones. Although porous rocks, including carbonates, are shown to undergo a brittle to ductile transition due to pore collapse as a result of increasing pressure, there are few constraints on the roles of pore water and temperature on this transition (Jefferd et al., 2021; Nicolas et al., 2017). As a result, we still have limited ability to extrapolate laboratory data and predict the mode of deformation in the Earth.…”

Section: Introductionmentioning

confidence: 99%

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Thermally Enhanced Water Weakening of the Solnhofen Limestone

et al. 2022

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We report the strength and deformation behavior of Solnhofen limestone across its brittle (localized) to ductile (distributed) transition. We conducted conventional triaxial compression tests on water‐saturated and nominally dry cores of Solnhofen at temperatures up to 200°C and effective confining pressures up to 350 MPa to evaluate the roles of pore water and temperature on the deformation mechanisms of low‐porosity limestone at conditions of the upper crust. The combined effects of water and temperature on deformation and strength of the limestone are complex and reflect the concurrent operation of microfracturing, which is enhanced by both pore water and temperature, crystal plasticity, which is enhanced by temperature but not pore water, and likely also dissolution which is enhanced by water but inhibited by temperature. At ambient temperature, water causes a small reduction in the yield strength and the strength in the ductile field, but has no measurable effect of the brittle peak strength or the effective pressure of the brittle to ductile transition. At elevated temperatures, water‐saturated Solnhofen exhibits weakening in both the brittle and ductile fields up to 200 MPa effective pressure. In addition, the combined effects of pore water and temperature reduce the pressure of the brittle to ductile transition dramatically. We propose that under dry conditions temperature reduces the pressure of the brittle to ductile transition by enhancing crystal plasticity and under water‐saturated conditions enhanced microcracking is responsible. At effective pressures greater than 200 MPa, ductile deformation becomes temperature strengthening indicating the onset of dissolution mediated deformation.

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Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermally Enhanced Water Weakening of the Solnhofen Limestone

et al. 2022

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“…Considerable research has confirmed that the friction coefficient exhibits a rate-temperature-stress state dependence (Barbot, 2022;Blanpied et al, 1995;Pranger et al, 2022;Scholz, 2019;Zhang & Ma, 2021). Furthermore, temperature also has a significant influence on fracture toughness and cohesion (Guo et al, 2023;Jefferd et al, 2021;Suo et al, 2020;Xu et al, 2023;C. X. Zhao, Liu, et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

“…Considerable research has confirmed that the friction coefficient exhibits a rate‐temperature‐stress state dependence (Barbot, 2022; Blanpied et al., 1995; Pranger et al., 2022; Scholz, 2019; Zhang & Ma, 2021). Furthermore, temperature also has a significant influence on fracture toughness and cohesion (Guo et al., 2023; Jefferd et al., 2021; Suo et al., 2020; Xu et al., 2023; C. X. Zhao, Liu, et al., 2023). However, it is regrettable that existing constitutive modeling efforts often resort to constant assumptions or curve fitting to describe the temperature response of mechanical characteristics such as strength, deformation, and damage of geological materials, lacking comprehensive consideration of the temperature‐dependent micromechanical mechanisms of fundamental mechanical properties like the friction coefficient, fracture toughness, and damage evolution.…”

Section: Introductionmentioning

confidence: 99%

Micro‐Thermomechanical Modeling of Rocks With Temperature‐Dependent Friction and Damage Laws

Lv,

Ren,

Lai

et al. 2024

JGR Solid Earth

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Temperature serves as a critical yet elusive factor impacting the mechanical properties of deep rocks. In this work, we shall develop a new micro‐thermomechanical model for rocks based on the Mori‐Tanaka homogenization scheme. Free energy and thermodynamic forces are deduced within the framework of irreversible thermodynamics, including the local stress applied on the mesocracks, damage driving force, macroscopic stress, and entropy. The salient innovation of this study lies in formulating subtle physically based temperature‐dependent friction and damage laws, considering the influence of ambient temperature on the mesocracking in rocks. Through a coupled friction‐damage analysis, a temperature‐dependent quasi‐static strength criterion and analytical stress‐strain‐damage relations are then derived. Physical implications and calibration methods of each parameter in the proposed model are meticulously presented. Furthermore, a semi‐implicit plasticity damage decoupled procedure (SIPDDC) integration algorithm is employed for the numerical implementation of the proposed model. Subsequently, numerical simulations are conducted to obtain the mechanical response of Jinping marble, Beibei sandstone, and Gongjue granite under various real‐time temperature‐confining pressure coupling conventional triaxial compression tests (TP‐CTC). The congruence of stress‐strain curves between model predictions and experimental data validates the robust performance and potential applicability of the proposed model.

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On the Role and Evolution of Local Grain Size Heterogeneity During Confined Compression of Boise Sandstone as Seen by X-ray Micro-CT Imaging

Louis,

Boyd,

Hofmann

et al. 2024

Rock Mech Rock Eng

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Compactive Deformation of Sandstone Under Crustal Pressure and Temperature Conditions

Abstract: The weakening is greater in the ductile regime than in the brittle regime. 10• A lowering of the fracture toughness can explain the observed weakening.

Cited by 8 publications

References 58 publications

Thermally Enhanced Water Weakening of the Solnhofen Limestone

Thermally Enhanced Water Weakening of the Solnhofen Limestone

Micro‐Thermomechanical Modeling of Rocks With Temperature‐Dependent Friction and Damage Laws

On the Role and Evolution of Local Grain Size Heterogeneity During Confined Compression of Boise Sandstone as Seen by X-ray Micro-CT Imaging

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