既有公路边坡扩建稳定性分析

Stability Analysis of Slope Expansion of the Existing Highway

为分析既有公路边坡扩建施工的稳定性,应用Midas软件进行数值模拟分析。由计算结果可知:边坡开挖后安全系数下降幅度较大,支护后明显提升;一级边坡主应力变化幅度较大,在坡脚以上4 m位置出现小范围应力松弛区,支护后应力值保持稳定;三级边坡在施工过程中产生的累计位移最大,支护后逐级趋稳,说明支护方案可有效控制边坡应力和变形,保证边坡处于稳定状态,方案具备可行性。

In order to analyze the stability of the existing highway slope expansion construction,the numerical simulation analysis is carried out by using Midas software.From the calculation results,it can be seen that the safety factor decreases greatly after slope excavation,and increases significantly after support.The main stress of the grade I slope changes greatly,and a small range of stress relaxation area appears at the position of 4m above the slope foot,and the stress value remains stable after support.The cumulative displacement of the grade III slope during the construction is the largest,and it is gradually stabilized after support,which indicates that the support scheme can effectively control the slope stress and deformation,ensure that the slope is in a stable state,and the scheme is feasible.