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用砂岩在不同应力级下进行单轴压缩试验,在偏光显微镜下鉴定,观测到微裂隙数量随应力加大而增加,当应力达到0.85σ_c时,微裂隙大量增加,还观测到微裂隙有三种类型:颗粒内部的微裂隙、颗粒之间的微裂隙和微断层。砂岩的破裂是颗粒内部的微裂隙,以及颗粒之间的微裂隙发展为微断层并进而相互作用连接的结果,其破裂过程基本上是微裂隙发生并互相作用渐进破坏的过程。试验证明,破裂过程严重受到岩性的影响。
The uniaxial compression tests were carried out at various stress levels using sandstone and identified under polarized light microscopy. The number of micro-fissures was observed to increase with increasing stress. When the stress reached 0.85σ_c, the micro-fissures increased significantly, and three micro-fissures were observed. Type: micro-cracks inside the particles, micro-cracks between the particles, and micro-faults. The fracture of the sandstone is the micro-cracks inside the particles, and the micro-cracks between the particles develop into micro-faults and then the result of the interaction and connection. The fracture process is basically a process in which the micro-cracks occur and gradually interact with each other. Tests have shown that the fracture process is severely affected by lithology.