基坑周边超载作用位置对基坑变形的影响

结合实际深基坑工程,基于数值模拟计算,通过改变基坑周边超载距围护结构的距离,分析了超载作用位置对基坑围护墙体侧移、周围地表沉降和坑内土体回弹的影响.结果表明:超载在墙外距离(0.2～0.5)H范围内引起的围护结构水平变形最大;距基坑0.2,H处超载对地表沉降有较大影响,且离基坑较远的超载会引起地表出现两个沉降槽;坑内土体回弹主要受开挖控制,超载作用对其影响不大.

Influence Caused by Overloading Action on the Deformation of Foundation Pit

In view of the actual foundation pit engineering,and based on numerical simulation,this paper analyzes the influence of overload location on lateral displacement of the retaining wall,ground subsidence and soil rebounding by way of changing the distance from the overload to the pit supporting structure.The research result shows that the maximum lateral displacement of the retaining wall appears when the overload is applied between（0.2~0.5）H away from the wall;when the overload is 0.2H away from the foundation pit,it has great influence on the ground settlement,moreover when the overload is applied far from the foundation pit,two settlement tanks will appear on the ground;the soil rebounding in the pit is mainly influenced by excavation,whereas the overload impact is insignificant.