基坑开挖与支护方式对邻近路基变形的影响

INFLUENCE OF EXCAVATION AND REINFORCEMENT MODE ON THE DEFORMATION OF ADJACENT SUBGRADE

以某住宅小区基坑开挖为工程背景,建立数值计算模型模拟基坑开挖与支护情况,分析放坡、坡率法联合土钉支护、桩锚支护三种方案下基坑和路基的竖向变形。结合基坑稳定性、支护效果及经济性进行了支护方案的综合比较,最终得出:坡率法联合土钉支护方案路基的竖向变形相对较小,对路基沉降影响小于桩锚支护方案和放坡方案;路基整体的变形及差异变形也较小,靠近基坑侧路基受到的影响远大于远离基坑侧路基。

With the foundation pit excavation of a residential district as the engineering background,a numerical calculation model is established to simulate the excavation and support of the foundation pit.The vertical deformation of the foundation pit and subgrade under the three schemes of slope caving,slope rate method combined with soil nailing support and pile anchor support is analyzed.The comprehensive comparison of the support schemes combined with the stability of the foundation pit,the support effect and the economy is made.The vertical deformation of subgrade in the scheme of slope ratio method combined with soil nailing is relatively small and the vertical settlement of subgrade is better than that of pile-anchor support scheme and slope caving scheme.The overall deformation and differential deformation of the subgrade are small,and the subgrade near the foundation pit is far more affected than the subgrade far away from the foundation pit.