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以承张高速某顺层页岩边坡工程为依托,首先采用单轴压缩模拟实验与宏观力学参数值对比的方法确定出边坡各岩土层的细观参数。进而建立其离散元模型,分析其稳定状态,并对其失稳过程进行研究。结果表明:边坡中的全风化页岩层向下滑动,并在坡脚堆积;强风化页岩层和中风化页岩层未发生滑动,滑动面为全风化页岩层与强风化页岩层的交界面。模型中出现的裂纹主要以压裂纹为主,且主要分布在全风化层,而其他两层未产生裂纹。离散元模拟结果与赤平投影法分析结果一致。该模拟结果对工程的设计、施工具有指导意义。
Based on the project of a bedding shale slope in Zhangzhang Expressway, the mesoscopic parameters of rock and soil layers in slope are first determined by the uniaxial compression simulation experiment and macroscopic mechanical parameter comparison. Then the discrete element model is established and the steady state is analyzed. The instability process is also studied. The results show that the fully weathered shale in the slope slides downward and piles up at the foot of the slope. There is no slip in the strongly weathered shale layer and the weathered shale layer. The sliding surface is the interface between the fully weathered shale layer and the strongly weathered shale layer. The cracks in the model are dominated by fractures and are mainly distributed in the fully weathered layer, while the other two layers are not cracked. Discrete element simulation results are consistent with the results of the stereographic projection method. The simulation results have guiding significance for the design and construction of the project.