软土中不同埋深地下通道开挖对邻近桩基的影响

摘要

运用三维快速拉格朗日分析程序 FLAC3D ，分析了软土中不同埋深地下通道开挖对邻近桩基及地表产生的影响，并对地下通道开挖引起的地表沉降变形进行了数值模拟，同时得到邻近桩基桩顶的水平位移和竖向位移，并根据邻近建筑物的允许变形值评估该地下通道开挖对建筑物的影响程度，根据计算结果和通道开挖过程中周围土体运动趋势可以得出，随着地下通道埋深的增加，桩顶水平位移和沉降位移也随之增加，且增加幅度较大。%With numerical code FLAC3D ,influence of pile foundation induced by adjacent underpass excavation in soft soil was researched. At the same time,surface deformation,by numerical code result,vertical and horizontal displacement of pile top were found. The impact of the un-derpass excavation will be estimated according to the allowable deformation of adjacent building. According the result and the moving current of soil beside underpass,we can see that vertical and horizontal displacement of pile top will enhance,if the depth of underpass increasing,and the volume extent is greater.