基于数值模拟的含软弱夹层路堑边坡稳定性分析

Stability Analysis of Cutting Slope with Weak Interlayer Based on Numerical Simulation

基于软弱夹层力学性质差,易导致边坡变形失稳破坏的工程问题,本文利用数值模拟分析方法,对比分析不同历时阶段下含有软弱夹层与不含软弱夹层的边坡稳定性状态,总结了边坡最大剪应变及塑性区分布的变形发展趋势,揭示了软弱夹层对边坡稳定性状态的影响程度。研究表明:相较于不含软弱夹层而言,含软弱夹层边坡的稳定性状态受开挖卸荷及降雨入渗等外界因素的影响性更大,坡体内部软弱夹层的流塑泥化,再加之抗滑力急剧降低,致使发生沿软弱夹层的滑坡灾害风险增大,因此有必要对含有软弱夹层的边坡工程实施合理有效的加固措施。

Weak interlayer has poor mechanical properties, which easily leads to deformation, instability and failure of slope. By means of numerical simulation, the stability state of slope with and without weak interlayer in different time periods is analyzed. The maximum shear strain and deformation development trend of plastic zone distribution of slope are summarized, and the influence degree of weak interlayer on slope stability state is revealed. The result shows that compared with the slope without weak interlayer, the stability state of the slope with weak interlayer is more affected by external factors such as excavation unloading and rainfall infiltration.