路堑边坡开挖稳定性及加固处治机理宏细观分析

高速公路深挖路堑形成的高大边坡稳定性问题，一直是公路建设中的重点风险源。以广东省江门市迎宾西路路堑边坡开挖及处治工程为背景，采用宏细观相结合的方法对边坡开挖及锚索加固处治机理进行分析。结果表明:①边坡开挖塑性变形区位移与接触力链发展方向显著相关，呈现沿坡面方向的链状发展规律；②边坡稳定性与坡体应力状况及局部区域应力发展变化密切相关，锚索加固的处治方案，可有效消除边坡体剪应变率贯通的剪切滑移面，边坡稳定性明显提高。

Micro-macro Analysis of Excavation Stability of Cutting Slope and the Mechanism of Reinforcement Treatment

The stability of highway deep excavation slope is always the key dangerous source in construction. The cutting slope along West Yingbin Road, Jiangmen City, Guangdong Province and its treatment engineering were taken as the background herein and, by means of micro-macro analysis, the excavation of slope and the treatment mechanism of anchor cable reinforcement were studied. The results show that, ① the displacement of plastic deformation zone in slope excavation is significantly correlated with the development direction of contact force chain, presenting a chain development law towards the slope surface; ② the slope stability closely relates to the stress condition of slope and the stress development and change in local area, and the scheme of anchor cable reinforcement may eliminate the shear slip plane at shear strain rate in the slope, thus significantly improve the stability.