中文摘要：

为了获取断层物质的受压剪切特性，用离散元法生成5种非规则颗粒单元来模拟自然条件下断层物质的直剪过程，以实验数据为参数，探讨了不同法向应力、摩擦系数、颗粒形状、试样颗粒组构对断层物质的剪应力的影响。结果表明，剪应力随法向应力、摩擦系数、非规则颗粒含量的增加而增大，不同法向应力、颗粒形状、试样组构下孔隙率的变化反映了剪应力的变化。

英文摘要：

In order to obtain the shear properties of the fault material, five irregular particle units generated by the discrete element method were used to simulate the direct shear process of the fault under natural conditions. By using the experi-mental data as the simulation parameters, the influences of shear stress of fault were studied with different normal stress, the friction coefficient, particle shape and composition of the irregular particles. The results show that the shear stress in-creases as the increasing of normal stress, the friction coefficient and the amount of the irregular particles. Furthermore, the changes of porosity under different normal stress, particle shapes or compositions show the changes of shear stress.