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为研究不同倾角裂隙砂岩试样在压缩过程中的围压效应,以室内单轴压缩试验结果标定岩体细观参数,采用改进刚体弹簧元法对不同倾角裂隙试样在不同围压下的破坏过程进行模拟。基于模拟结果,研究了围压对岩样强度、破坏模式及微裂纹发育特征的影响。结果表明,裂隙砂岩试样在压缩过程中具有明显的围压效应,相同裂隙倾角试样,其峰值强度、残余强度、弹性模量和变形模量均表现出随围压增加而增加的规律;不同围压作用下,不同倾角裂隙试样内部微裂纹演化规律相似,且其最终破坏形态均表现出以剪切破坏为主的破裂方式。
In order to study the confining pressure effect of sandstone samples with different tilt angles during compression, the meso-parameters of rock mass were calibrated by indoor uniaxial compression test and the damage of specimens with different tilt angles under different confining pressures Process simulation. Based on the simulation results, the effects of confining pressure on the strength and failure modes of rock samples and the development of microcracks were studied. The results show that the fractured sandstone samples have obvious confining pressure effect during the compression process. The peak strength, residual strength, elastic modulus and deformation modulus of the specimens with the same crack angle increase with the increase of confining pressure. Under different confining pressures, the internal microcracks evolve regularly in different inclinations, and the ultimate failure mode shows the fracture mode with shear failure.