Soil-rock-mixture (SRM), consisting of high-strength rock blocks and low-strength soil, is widely distributed in nature. In traditional methods such as limit equilibrium methods, this geomaterial was simplified as a uniform medium without considering the influence of rocks due to its heterogeneity and complex physical and mechanical properties. A coupling method that bridges discontinuous deformation analysis (DDA) for rock simulation and smoothed particle hydrodynamics (SPH) for soil simulation is a promising tool for SRM problems. In this study, the 2D coupled DDA-SPH method is extended to the applications of stability and post-failure analysis of SRM slopes. First, the determination of the contact spring stiffness in the contact algorithm is presented and the reasonable value is discussed. Then, to eliminate the oscillations in some simulations with polygonal rock blocks inside the soil, the contact algorithm is modified by implementing a special treatment for the contact between the SPH particles and the convex vertices of DDA blocks. In addition, the criterion based on the distribution of plastic zone is used to define the critical stable state of the slope when applying the strength reduction technique for stability analysis, and its effectiveness is demonstrated. Finally, a series of numerical analyses are carried out, and through these numerical simulations, some conclusions and suggestions can be reached.

土壤-岩石-混合物（SRM）由高强度岩石块和低强度土壤组成，在自然界广泛分布。在极限平衡法等传统方法中，由于其非均质性和复杂的物理力学性质，这种岩土材料在不考虑岩石影响的情况下，被简化为均匀介质。一种连接岩石模拟的不连续变形分析 (DDA) 和土壤模拟的平滑粒子流体动力学 (SPH) 的耦合方法是解决 SRM 问题的有前途的工具。在这项研究中，二维耦合 DDA-SPH 方法扩展到 SRM 边坡稳定性和故障后分析的应用。一、联系方式的确定给出了接触算法中的弹簧刚度并讨论了合理的取值。然后，为了消除土壤内部多边形岩石块模拟中的振荡，通过对 SPH 粒子与 DDA 块凸顶点之间的接触进行特殊处理来修改接触算法。此外，在应用强度折减技术进行稳定性分析时，采用基于塑性区分布的准则来定义边坡的临界稳定状态，并证明了其有效性。最后，进行了一系列数值分析，通过这些数值模拟，可以得出一些结论和建议。