含软弱夹层的某公路边坡开挖支护数值模拟分析

基于某含有软弱夹层的公路边坡工程，利用有限元软件对其开挖支护过程进行数值模拟分析，计算考虑了2种不同的开挖工况：1）只开挖不支护；2）开挖并及时支护。研究表明：在开挖未支护时，边坡开挖完成后安全系数小于1，边坡整体都发生很大位移，将沿着软弱夹层带发生破坏；在开挖并及时支护时，边坡位移明显减小，软弱夹层附近塑形变形区得到了有效控制，且开挖完成后安全系数为1．87，满足设计要求。

Numerical Simulation of Excavation and Support for Highway Slope with Weak Intercalated Layers

Aiming at a highway slope project with weak intercalated layers, finite element software was used to simulate and analyze the process of the slope excavate and support, two different working conditions of excavation were taken into consideration.one was excavation without supporting ;another was excavation with supporting.The results indicated that the factor of safety was less than the first after the completion of slope excavation when without support, and large relative slide was induced by the direct excavation;When excavation with supporting in time, the slope displacement was obviously reduced, and weak intercalated layer near the plastic deformation zone was effectively controlled.After the completion of the excavation, factor of safety was 1.87, which met the design requirement.The results provided some reference for the construction of similar slope engineering.