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A Three-Dimensional Nonlinear Strength Criterion for Rocks Considering Both Brittle and Ductile Domains
A three-dimensional nonlinear strength criterion for rocks considering both brittle and ductile domains is proposed through the combination of the...
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Physical Model Study on Brittle Failure of Pressurized Deep Tunnel with Support System
Severe instability disasters of hard rock often occur in pressurized deep tunnels with support systems. To investigate the deformation...
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Dynamic behaviors of rockslides subjected to brittle failure of locked segments
Locked segments are recognized as a critical role that controls the stability of rock slopes but remain an unclear and challenging problem with...
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Study on mechanical properties and elasto-brittle-plastic constitutive model of hard brittle rock based on conventional triaxial test
Due to the degradation of the elastic modulus and Poisson’s ratio, hard brittle rock is characterized as non-linear mechanical properties. Elastic...
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A multi-method investigation of the permeability structure of brittle fault zones with ductile precursors in crystalline rock
Brittle faults and fault zones are among the most hydraulically active elements in predominantly impermeable crystalline host rock. They pose...
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A Micromechanics-Based Multiscale Constitutive Model for Brittle to Ductile Behavior of Porous Geomaterial
Brittle to ductile transition with the increase of confining pressure is a common behavior of porous geomaterial. In the present work, a...
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A micro–macro model evaluating thermal treatment temperature effect on compressive failure of brittle rocks
Thermal treatment temperature strongly influences the compressive fracture mechanical properties of brittle rocks with many microcracks. However, the...
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Mechanical Deformation, Acoustic Emission Characteristics, and Microcrack Development in Porous Sandstone During the Brittle–Ductile Transition
To investigate the micromechanical properties of sandstones during brittle and ductile failure, we conducted uniaxial and conventional triaxial...
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Anisotropy on the ductile-to-brittle transition for rock in process of drilling
Anisotropy is an inherent property of rocks. It refers to the different response of the rock properties in each direction. Understanding the...
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Brittle initiation of dissolution–precipitation creep in plagioclase-rich rocks: insights from the Bergen arcs, Norway
The initiation of ductile shear zones commonly occurs spatially associated with fluid-rock reactions along brittle precursors. In many cases the...
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A brittle-ductile index for transversely isotropic rock based on energy evolution of the characteristic stress and its application
The mechanical behavior of the brittle-ductile transformation of rock is an important aspect of rock mechanics research. To study the evaluation...
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Modeling of Hydro-mechanical Coupled Fracture Propagation in Quasi-brittle Rocks Using a Variational Phase-Field Method
This paper presents a new variational phase-field model aimed at investigating the fully coupled hydro-mechanical-damage processes in saturated...
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Creep Mechanical Properties and Constitutive Model of Hard Brittle Mud Shale
Mud shale is characterized by low strength and strong swelling, with rheological effects and deformation caused by drilling fluid and formation...
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A Microplane-Based Anisotropic Damage Model for Deformation and Fracturing of Brittle Rocks
Anisotropy is an important property that is widely present in crustal rocks. Efforts have been devoted to providing a constitutive model that can...
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Quantitative Evaluation of Shale Brittleness Based on Brittle-Sensitive Index and Energy Evolution-Based Fuzzy Analytic Hierarchy Process
A quantitative method for evaluating brittleness is pivotal in optimizing hydraulic fracturing of shale. Shale reservoirs are characterized by...
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A Micromechanical Damage Model for Quasi-Brittle Rocks Subjected to Fatigue-Creep Loading
To accurately describe the long-term deformation of quasi-brittle rocks, a micromechanical elastoplastic model is proposed for modeling the...
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Evidence of Brittle Tectonic Continuity Between Precambrian Basement of Aïr and Its Sedimentary Cover (Northeast Niger)
Aïr Precambrian basement (NE Niger) is unconformably overlain by deposits of the Tim Mersoi basin at West and of the Tenere basin at Southeast. The...
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Brittle failure modes of underground powerhouses: an insight based on true triaxial compression tests
The directions of in situ principal stresses and curvature of the opening boundary play a major role in determining the failure modes of underground...
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Experimental Study of Fracture Initiation and Morphology in Low-Brittle Shales with Bedding Planes subjected to LN Fracturing
Liquid nitrogen (LN) can deteriorate rock structure and mechanical properties. It is an effective method for engineering applications in deep...
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Quantitative description of stress-dependent post-peak brittle characteristics and numerical implementation
In this study, based on true-triaxial compression tests, five typical post-peak brittle characteristics are summarized, and the stress dependence is...
