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基于恒定围压下砂岩的三轴压缩试验,得到不同围压下的应力应变曲线。认为压缩过程中的体积应变是由基体材料的弹性体积应变和裂隙体积应变组成,通过计算得到裂隙体积应变在压缩过程中各阶段随各应力、应变的变化关系,从而得到裂隙演化规律。
Based on the triaxial compression tests of sandstone under constant confining pressure, the stress-strain curve under different confining pressures was obtained. It is considered that the volumetric strain in the compression process is composed of the elastic volumetric strain of the matrix material and the volumetric strain of the fracture. The relationship between the strain and the volumetric strain of the fracture during the compression process is calculated, and the evolution law of the fracture is obtained.