摘要
对某地铁深基坑开挖与支护过程进行有限元仿真计算与分析,重点分析计算桩锚联合支护基坑周边地表竖向沉降规律及其与围护桩插入比、锚杆锚固长度的关系。研究结果表明:基坑周边地表沉降曲线呈"凹槽型",地表最大沉降位于距基坑壁0.3～0.7H(H为基坑深度)的范围;随锚杆锚固长度的增大,地表沉降槽峰值沉降点有远离基坑的趋势;本基坑项目围护桩的最优插入比为0.3左右;地表峰值沉降随锚杆锚固长度的增大而呈线性减小的趋势。
The finite element simulation calculation and analysis of the excavation and support process of a deep foundation pit of a subway are carried out. This paper mainly calculates and analyzes the vertical settlement pattern of the ground around the foundation pit with pile-anchor combined support and its relationship with the insertion ratio of retaining piles and the anchorage length of anchor rods. The results show that the surface settlement curve around the foundation pit is Groove Type, and the maximum surface settlement value lies in the depth of the foundation pit about 0.3-0.7 H from the foundation pit wall. With an increase of anchor length, the peak settlement point of the surface settlement groove tends to be far away from the foundation pit. The optimal insertion ratio of retaining piles in the foundation pit project is about 0.3, and the peak surface settlement appears with the increase of anchor length and linear decreasing trend.
出处
《现代城市轨道交通》
2019年第4期26-29,共4页
Modern Urban Transit
关键词
地铁
深基坑
桩锚支护
锚固长度
插入比
变形规律
metro
deformation of deep and large foundation pit
pile-anchor support
anchorage length
insertion ratio
deformation law
