公路拓宽工程中桩承式加筋挡土墙处置路基的数值分析研究

Numerical Analysis on the Pile-supported Reinforced Retaining Wall Dealing with the Embankment in Highway Widening Engineering

结合绍诸高速上三段拓宽工程的建设，采用FLAC3D对桩承式加筋土挡墙施工对原路基的影响、新老路基的沉降发展规律进行分析。研究表明，原路基边坡开挖后的卸荷作用会使原路基变形出现回弹；管桩施工对原路基的影响较小；施工后，路基的新增沉降呈“~”形，在路基中心线处新增沉降最小，在拓宽路基部分新增沉降最大。

Combined with the Shangsai widening project construction of Shaozhu express way,the effects of pile-supported reinforced retaining wall construction on original founda-tion and settlement development law of old and new embankment had been studied by FLAC3D. The results showed that,the unloading effect of road slope after excavation would make the old road deformation rebound;pile construction had little effect on the old road;after construction,the new settlement in the “ ~” shape,the new settlement in the center of embankment was the minimum,while the maximum happened in widening embankment.