Effects of confining pressure on deformation failure behavior of jointed rock

for a deeper understanding of the deformation failure behavior of jointed rock, numerical compression simulations are carried out on a rock specimen containing non-persistent joints under confining pressure with the bonded-particle model. The microscopic parameters which can reflect the macroscopic...

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Bibliographic Details
Published in:Journal of Central South University 2022-04, Vol.29 (4), p.1305-1319
Main Authors: Chen, Miao, Zang, Chuan-wei, Ding, Zi-wei, Zhou, Guang-lei, Jiang, Bang-you, Zhang, Guang-chao, Zhang, Cheng-peng
Format: Article
Language:English
Subjects:
Bonded joints
Compressive strength
Confining
Contact force
Contact pressure
Contact stresses
Crack initiation
Crack propagation
Deformation effects
Engineering
Failure modes
Inclination
Jointed rock
Mechanical properties
Metallic Materials
Modulus of elasticity
Parameters
Pressure effects
Rock masses
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Summary:for a deeper understanding of the deformation failure behavior of jointed rock, numerical compression simulations are carried out on a rock specimen containing non-persistent joints under confining pressure with the bonded-particle model. The microscopic parameters which can reflect the macroscopic mechanical properties and failure behavior of artificial jointed specimens are firstly calibrated. Then, the influence of joint inclination and confining pressure on stress — strain curves, crack patterns, and contact force distributions of jointed rock are investigated. The simulation results show that both the compressive strength and elastic modulus of the specimens increase with increasing confining pressure, and these two mechanical parameters decrease first and then increase with the increase of joints inclination. The sensitivity of strength and elastic modulus to confining pressure is not the same in different joints inclinations, which has the least impact on specimens with α =90°. Under low confining pressure, the failure modes are controlled by the joint inclination. As the confining pressure increased, the initiation and propagation of tensile crack are gradually inhibited, and the failure mode is transferred from tensile failure to shear-compression failure. Finally, the reinforcement effect of prestressed bolt support on engineering fractured rock mass is discussed.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-022-4991-z