地下连续墙条件下基坑渗流场和应力场模拟分析  

Simulation of seepage field and stress field in the foundation pit adopting diaphragm wall

作　　者：孙志[1] 周援衡[1,2] 孔伟[1] 任启江[1] 

机构地区：[1]长沙理工大学水利河海工程学院,湖南长沙410076 [2]中南大学土木建筑学院,湖南长沙410075

出　　处：《水运工程》2009年第11期23-28,共6页Port & Waterway Engineering

摘　　要：运用拉格朗日差分法,对采用地下连续墙的深基坑工程建立数值模型,分析了不同高度挡墙对渗流场、应力场的影响。计算结果表明:地下连续墙的高度超过基坑底部的深度时,坑角地下水渗流速度、土体竖直应力减小,墙体两侧水头差、土体水平应力增大;墙体高度进一步增加时,渗流速度、墙体两侧水头差、土体应力变化幅度逐渐减小,趋于稳定。同时计算结果还表明,地下连续墙发生断裂后,坑角断裂区域附近土体渗流速度、水平应力急剧变大,极易产生渗透破坏,说明墙体发生破坏时,渗透破坏的危险性甚至可能高于无挡墙的情况。Deep foundation pit with diaphragm wall is simulated by Lagrangian difference method. The seepage field and stress field are analyzed in different height of diaphragm wall. The calculation results show that the flow vector of groundwater and vertical stress of soil body decrease with the increase of the height of the diaphragm wall, but water head difference on both sides of the wall and horizontal stress of soil body rise. When the height of wall increases further,they all tend to be stable gradually. Meanwhile, the flow vector of the underground water and horizontal stress near the fracture region turns dramatically larger after fracture of the diaphragm wall happened. When the wall is damaged, the danger of the foundation pit from seepage of the wall is even higher than that of no walk

关 键 词：基坑 地下连续墙 渗流场 应力场 拉格朗日差分法 

分 类 号：TU476.3[建筑科学—结构工程]