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以张承高速某高边坡工程为依托,采用单轴压缩模拟试验标定出边坡各岩土层的细观参数,建立边坡的离散元模型,分析了边坡的稳定状态,并对边坡的失稳过程进行了研究。结果表明:粉土层向下滑动,并在坡脚堆积,圆砾层未发生滑动。模型中出现的裂纹主要在粉土层。边坡的破坏过程如下:首先粉土层颗粒在重力作用下黏结被破坏,由于粉土层底部颗粒先滑出坡面,使中上部颗粒失去支撑而发生大规模滑动。基于上述分析,建议对边坡开挖后采取锚索或土钉进行支护,同时对坡面采用水泥砂浆防护等加固措施。
Based on a high-slope project of Zhangcheng Expressway, the uniaxial compression simulation test was used to calibrate the mesoscopic parameters of the rock slope and the discrete element model of the slope was established. The stability of the slope was analyzed, The slope instability process was studied. The results show that the silt layer slides downward and piles up at the foot of the slope, and the round gravel layer does not slip. Cracks that appear in the model are mainly in the silt layer. The process of slope failure is as follows: Firstly, the silt particles under the action of gravity are destroyed. As the bottom part of the silt layer slides out of the slope first, the middle and upper particles lose their support and large-scale sliding occurs. Based on the above analysis, it is suggested to use the anchor cable or soil nail to support the slope after excavation, and to reinforce the slope with cement mortar protection.