中文摘要：

针对土石混合体材料自身所存在的非均质性、非连续性及其所表现出来的结构效应，采用PFC3D（Particle Flow Code）颗粒流离散元计算程序，从材料的复杂结构人手并通过简化的方法建立了土石混合体二维颗粒流随机结构模型，并对所建模型进行了压剪变形破坏的数值试验，最后对试验所得的剪应力．位移关系曲线进行了分析。结果表明，在剪切荷载加载的初始阶段，主要表现为土体的变形破坏特性，随着应变的发展，块石与土体交错挤压所形成的结构效应开始起作用，并且含石率越高，这种结构效应对峰值的贡献也越大。

英文摘要：

According to the self-characteristic of heterogeneity, discontinuity of rock-soil aggregate material and its structural effect, a stochastic structural model is established with PFC （Particle Flow Code） 3D program through simplification of the complex structure of RSA in some extent. And a numerical experiment has been done on the shear deformation under pressure for this model, the relationship curve between the sheer obtained from the experiment and displacement has been analyzed. Results show that during the initial stage of shear loading, there mainly emerges deformation of soil. The structural effect resulted from cross compression between rock and soil starts work with the development of strain. And the higher the rock content rate is, the greater influence the structural effect has on the peak.