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土石混合体是一类较为复杂的宏观二元介质不连续岩土体,不同的块体分布情况及不同的试件尺度导致其具有不同的等效强度特性。基于随机集合体构造(RA S)方法构建了土石混合体的随机模型,编制程序实现了随机模型的输出和数值模型的生成。以西南某大型堆积体滑坡中的典型土石混合体为例,考虑含石量和不同粒径分布规律,建立多组不同尺寸随机模型,进行了大量的数值试验,得到了强度表征单元体积(REV)尺度,在此基础上得到了等效强度参数,并分析了土石混合体受力性能和渐进破坏模式。研究结果表明,土石混合体存在REV尺度,案例所得的REV尺度为1.0 m×1.0 m,不同尺度数值计算结果有一定差别,基于REV尺度的力学参数才符合工程意义。
The soil-rock mixture is a kind of complex macroscopic binary medium discontinuous rock and soil mass. The distribution of different blocks and different specimen scales lead to different equivalent strength characteristics. A stochastic model of soil-rock mixture was constructed based on the random aggregate construction (RA S) method, and the output of stochastic model and the generation of numerical model were realized by programming. Taking a typical soil-rock mixture in a large-scale accumulation landslide in southwest China as an example, a large number of numerical experiments were set up considering the distribution of stone content and different particle sizes. A series of numerical experiments were carried out to obtain the intensity-characterizing unit volume (REV ) Scale, on the basis of which the equivalent strength parameters are obtained, and the mechanical behavior and progressive failure mode of soil-rock mixture are analyzed. The results show that the REV scale exists in the soil-rock mixture, and the REV scale obtained in the case is 1.0 m × 1.0 m. The calculation results of the different scales have some differences. The mechanical parameters based on the REV scale are in engineering significance.