Soil-rock mixture is a widely distributed geological material in mountainous regions, where slope stability is an important issue. To investigate the influence of rock on slope stability, firstly, rocks in SRM are generated and then SRM slope models are simulated based on the finite difference method (FDM). The impact of various characteristics of rocks on slope factor of safety (FOS) is studied systematically by using the reduced strength method. The characteristic of rock considered include rock content, number of rock edges, aspect ratio, rock size and inclination of rock. The simulations indicate that increasing the rock content can prevent the development of high strain region and improve slope stability. However, the aspect ratio of rock has negligible impact on the mean value of FOS. For slopes with 45° slope angle, rocks with 45° angle of inclination result in smooth potential sliding surface, whereas rocks with 135° angle of inclination lead to more tortuous potential sliding surfaces. Statistical indices are utilized to analyze the results of numerical modelling.

土石混合物是山区的一种广泛分布的地质材料，在该地区，边坡稳定性是一个重要问题。为了研究岩石对边坡稳定性的影响，首先生成SRM中的岩石，然后基于有限差分法（FDM）模拟SRM边坡模型。运用强度折减法，系统地研究了岩石的各种特性对安全系数的影响。所考虑的岩石特征包括岩石含量，岩石边缘数量，纵横比，岩石尺寸和岩石倾角。模拟表明，增加岩石含量可以防止高应变区域的发展并改善边坡稳定性。但是，岩石的纵横比对FOS平均值的影响可以忽略不计。对于45°倾斜角的斜坡，倾斜角度为45°的岩石会形成光滑的潜在滑动表面，而倾斜角度为135°的岩石会导致更弯曲的潜在滑动表面。统计指标用于分析数值建模的结果。