软土地区坑中坑对基坑围护体水平位移影响分析

Effect of Lateral Displacement of Supporting for Pit in Foundation Pit in Soft Soil Area

通过对软土地区某基坑工程实践进行有限元数值模拟,分析了排桩、重力坝两种基坑围护形式下大型坑中坑里面内、外坑之间距离对两坑围护体水平变形的影响。计算数据表明,内外坑距离越大,外坑围护体水平位移越小,当距离大于2~3倍内坑深度后,围护体水平变形可以不用考虑坑中坑的影响。内外坑距离越大,内坑围护体水平位移越小;内坑围护体水平变形受外坑围护体刚度影响,外坑围护体刚度越大,内坑围护体变形越小。

Based on the numerical analysis for effect of lateral displacement of supporting for pit in foundation in soft soil area,the influence of the distance is analysis between the inner and outer pits of a large pit on the horizontal deformation of the supporting structure under the two types of pits and gravity dams.The calculated results showed that the distance is the larger between the inner and outer pits,the horizontal displacement is the smaller of the outer pit,when the distance is greater than 2~3 times the pit depth,the horizontal deformation of the supporting structure can't consider the influence of pit.The distance is the larger between the inner and the outer pits,the horizontal displacement is the smaller of the inner pit;Horizontal deformation of inner pit is affected by the stiffness of outer pit.The lateral displacement of inner supporting structure reduces with the increasing stiffness of outer supporting structure.