Failure and mechanical behavior of transversely isotropic rock under compression-shear tests: Laboratory testing and numerical simulation
Failure and mechanical behavior of transversely isotropic rock under compression-shear tests: Laboratory testing and numerical simulation
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DOI：
10.1016/j.engfracmech.2020.107389
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发表时间：
2021
影响因子：
5.4
通讯作者：
R. Cao;Rubing Yao;Tao Hu;Changsong Wang;Kaihui Li;J. Meng
中科院分区：
文献类型：
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作者：
R. Cao;Rubing Yao;Tao Hu;Changsong Wang;Kaihui Li;J. Meng
横向各向同性岩石的破坏和力学行为受到原始层理平面的显著影响。到目前为止，研究层理面几何力学参数对横向各向同性岩石在平面剪切断裂加载条件下断裂特征的影响的研究还很少。为此，对双缺口试件进行了压剪试验和数值试验，研究了横向各向同性岩石在平面剪切破坏荷载作用下的破裂特性。实验研究了层理面倾角对裂缝载荷、裂缝形态和声发射演化的影响，研究了6个倾角。基于PFC2D（颗粒流程序）中的平面节理接触模型（针对岩石基体）和光滑节理接触模型（针对原始层理平面），模拟分析了不同倾角横向各向同性岩石的微尺度破裂过程。结果表明：倾角对断裂载荷和断裂模式有重要影响，试件倾角为30°和60°时获得最大断裂载荷和最小断裂载荷；此外，原始层理面的强度和间距对断裂载荷也有重要影响。层理面强度越大，层理面间距越大，裂缝载荷越大。此外，在倾角适中的情况下，横向各向同性、顺层面强度较高的岩石容易形成裂缝，穿透岩石基质。但随着层理面强度的降低，沿层理面的裂缝增多。
The failure and mechanical behavior of transversely isotropic rock are significantly affected by the original bedding planes. Until now, few studies have been performed to investigate the influence of the geometrical and mechanical parameters of the bedding planes on the fracture characteristics of transversely isotropic rocks under planar shear fracture loading conditions. For this purpose, experimental and numerical compression-shear tests on double-notched specimens are conducted to investigate the fracturing characteristics of transversely isotropic rock under planar shear fracture loading. The experimental study that focuses on the influence of bedding plane inclination on fracture load, fracture pattern and AE evolution, and six inclination angles is conducted in this study. Based on the flat joint contact model (for the rock matrix) and smooth joint contact model (for the original bedding plane) in PFC2D (particle flow code), the microscale fracturing process of transversely isotropic rock with different inclinations is simulated and analyzed. The results show that the inclination has an important influence on the fracture load and fracture pattern, and the maximum and minimum fracture loads are obtained for specimens with inclination angles of 30° and 60°, respectively. Moreover, the strength and spacing of the original bedding planes also play an important role in fracture loads. Higher bedding plane strength and wider bedding plane spacing result in higher fracture loads. In addition, with a moderate inclination angle, transversely isotropic rock with higher bedding plane strength tends to form cracks that cut through the rock matrix. However, with the decrease in the bedding plane strength, more fractures form along the bedding planes.