预应力锚索抗滑桩加固边坡的动态监测及有限元分析

Dynamic Monitoring and Finite Element Analysis of Slopes Reinforced with Pre-stressed Anchor Anti-slide Piles

本文以某沿海高速公路K21滑坡工程治理为例，采用现场监测结合有限元分析方法，对预应力锚索抗滑桩加固边坡的加固效果进行分析。首先，通过监测数据分析了解加固边坡受力状态，并对预应力锚索抗滑桩的加固效果进行评价，进而评定边坡的稳定状态。然后，运用大型通用有限元软件ABAQUS建立锚索抗滑桩加固边坡的有限元模型，采用考虑桩．土相互作用的强度折减法对加固前后边坡的稳定状态进行分析。结果表明：锚索抗滑桩对边坡的加固效果很明显。边坡由加固前的不稳定状态转变为加固后的稳定状态。此工程现已完毕并且安全使用两年，可为类似工程的加固和有限元分析提供参考。

This paper has analyzed the reinforcement effect of the pre-stressed anchor anti-slide piles by means of the local monitoring and FEM （finite element method）, taking the K21 landslide of some Coastal Expressway as example. At first, the strained condition of reinforced slope was measured followed by the assessment on the reinforcement effect of the reinforced pre-stressed anchor anti-slide piles and further the stability of the slope. Next, the FEM of the reinforced pre-stressed anchor anti-slide piles has been established by ABAQUS, a general large finite element software, to analyze the stability of slope before and after reinforcement considering the strength reduction method. The result indicated that the effect of the reinforced pre-stressed anchor anti-slide piles is evident and the slope stability turned well compared to the pre-reinforcement. The case project has been in service for two years, which is of reference value for this kind case.