土石混合体是由高强度块石和低强度土体组成的一类特殊工程地质材料,其力学性质可通过直剪试验进行确定.论文针对土石混合体的细观材料特性,分别采用球形颗粒单元和非规则组合颗粒单元模拟土体和块石材料,对其在不同含石量和颗粒粘结强度下的直剪试验过程进行离散元分析.计算结果表明,土石混合体的抗剪强度随着含石量和粘结强度的增加而增加;通过不同法向应力下直剪试验的离散元分析,确定了不同含石量下土石混合体材料的内摩擦角和粘聚力.论文研究结果有助于进一步揭示土石混合体的抗剪强度特性. Soil-rock mixture is a kind of special engineering geological material composed of high-strength rock mass and low-strength soil, whose mechanical properties can be determined by direct shear test.According to the characteristics of mesoscopic materials of rock-soil mixture, spherical- The results show that the shear strength of soil-rock mixture increases with the increase of the content of inclusions The amount of rock mass and the bond strength increase, and the internal friction angle and cohesion of rock-soil mixture under different rock mass contents are determined by the discrete element analysis of direct shear tests under different normal stresses.The research results are helpful To further reveal the shear strength of soil-rock mixture characteristics.