Investigations of the Progressive Damage and Failure Behaviors of Thermally Treated Granite Under the Coupling Action of Biaxial Stress Constraint and High Strain Rate

Gong, Hangli; Luo, Yi; Wang, Gang; Liu, Tingting; Li, Xinping

doi:10.1007/s00603-024-03945-z

Rock Mech Rock Eng

2024

DOI: 10.1007/s00603-024-03945-z

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Investigations of the Progressive Damage and Failure Behaviors of Thermally Treated Granite Under the Coupling Action of Biaxial Stress Constraint and High Strain Rate

Hangli Gong,

Yi Luo,

Gang Wang

et al.

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Stress‐Confinement Effect on the Dynamic Mechanical Properties of Heterogeneous Granite Under Impact Loading: Experimental and Numerical Simulation

Gong,

Wang,

Luo

et al. 2024

Num Anal Meth Geomechanics

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To investigate the stress‐confinement effect on the dynamic crack propagation and energy evolution characteristics of heterogeneous granite under impact loading, a three‐dimensional equivalent grain‐based model (3D‐GBM) and FLAC3D‐PFC3D coupled modeling technique was used to establish a numerical model of a full‐scale true triaxial Hopkinson test system. The results indicate that: (1) A rate‐effect model of the dynamic strength enhancement factor for heterogeneous rocks under multiaxial static and dynamic combined loading was constructed, with lateral stress confinement enhancing the sensitivity of dynamic strength to the strain rate. (2) Axial stress reduces the crack initiation stress ratio (σci/σd) and damage stress threshold ratio (σcd/σd), reducing the time to their onset, while lateral stress has the opposite effect. (3) Lateral stress confinement helps dynamically adjust the types of microcracks within the rock, restricts the relative slip friction between particles, and decreases the kinetic energy of failure. (4) At approximately the same strain rate, the strain energy and slip friction energy sequentially increase under uniaxial, biaxial, and triaxial stress confinement. The mutual slip friction and movement between rock particles are more intense under biaxial stress confinement compared to uniaxial conditions.

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Stress‐Confinement Effect on the Dynamic Mechanical Properties of Heterogeneous Granite Under Impact Loading: Experimental and Numerical Simulation

Gong,

Wang,

Luo

et al. 2024

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

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Investigations of the Progressive Damage and Failure Behaviors of Thermally Treated Granite Under the Coupling Action of Biaxial Stress Constraint and High Strain Rate

Cited by 1 publication

References 64 publications

Stress‐Confinement Effect on the Dynamic Mechanical Properties of Heterogeneous Granite Under Impact Loading: Experimental and Numerical Simulation

Stress‐Confinement Effect on the Dynamic Mechanical Properties of Heterogeneous Granite Under Impact Loading: Experimental and Numerical Simulation

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