Particle simulation of the failure process of brittle rock under triaxial compression
Particle simulation of the failure process of brittle rock under triaxial compression
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DOI：
10.1007/s12613-010-0350-4
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发表时间：
2010-10-01
影响因子：
4.8
通讯作者：
Zhou, Ke-ping
中科院分区：
文献类型：
--
作者：
Xia, Ming;Zhou, Ke-ping
为了从实验和数值两方面研究脆性岩石在三轴压缩条件下的破坏过程，采用颗粒模拟方法进行了数值模拟，并将模拟结果与实验结果进行了比较。详细讨论了断裂扩展、微裂纹分布、应力应变响应和损伤模式等数值模拟结果。在不同围压下（0-60 MPa），模拟结果与实验结果吻合较好。模拟结果表明，在单轴压缩条件下，岩石的破坏是由轴向劈裂引起的。随着围压的增加，岩石在少数局部剪切面内发生破坏，岩石的力学行为由脆性向韧性转变。因此，峰值破坏强度，微裂纹数和剪切面角增加，但拉剪微裂纹的比例减小。在压缩模拟过程中的损伤形成表明，粒子模拟方法可以产生类似的行为，通过实验室压缩试验观察到的。
In order to investigate the failure process of brittle rock under triaxial compression through both experimental and numerical approaches, the particle simulation method was used in numerical simulations and the simulated results were compared with those of the experiment. The numerical simulation results, such as fracture propagation, microcrack distribution, stress-strain response, and damage patterns, were discussed in detail. The simulated results under various confining pressures (0-60 MPa) are in good agreement with the experimental results. The simulated results reveal that rock failure is caused by axial splitting under uniaxial compression. As the confining pressure increases, rock failure occurs in a few localized shear planes and the rock mechanical behavior is changed from brittle to ductile. Consequently, the peak failure strength, microcrack numbers, and the shear plane angle increase, but the ratio of tensile to shear microcracks decreases. The damage formation during the compression simulations indicates that the particle simulation method can produce similar behaviors as those observed through laboratory compression tests.