中文摘要：

以川藏公路某边坡为例，对路堑开挖进行模拟并分析了开挖前后边坡的稳定性。参照现场工程地质勘察及区域相关资料，恢复了公路修建前的原始地貌，据此建立计算模型。公路修筑的快速拉格朗日法模拟揭示了公路开挖后边坡内部应力分布规律、位移变化及边坡失稳过程。而强度折减法对开挖前后边坡的稳定性评价结果也表明路堑开挖是该边坡失稳的主要原因。

英文摘要：

Taking a certain slope of Sichuan-Tibet Highway as an example, this study simulated the slope excavation and analyzed the stability before and after its excavation. According to engineering geology investigation on the spot and the relevant data, the original landforms before the highway＇s building appeared again, thereby the calculated model being developed. Fast lagrangian analysis of continua method was employed to simulate the distribution of internal stress, the change of displacement and the course of slope instability. The results of strength reduction method showed that the excavation of roadcut was the main cause of slope instability.