上海地区深基坑周边地表变形性状实测统计分析

收集了上海软土地区 35 个具有墙后地表沉降实测资料的深基坑工程案例，从统计角度研究了深基坑的墙后地表变形性状。最大地表沉降随着开挖深度的增大而增大，其值介于 0.1 ％ H ～ 0.8 ％ H 之间，平均值为 0.38 ％ H ，其中 H 为基坑开挖深度。 影响因素分析表明最大地表沉降随着墙后软土层厚度的增大而增大，随着坑底抗隆起稳定系数的增加而减小，而与围护墙的插入比及支撑系统刚度的关系不大。 最大地表沉降与最大墙体侧移的比值基本介于 0.4 ～ 2.0 之间，其平均值约为 0.84 。统计了墙后地表沉降的分布模式，给出了墙后地表沉降的包络线。最大地表倾斜量介于 0.001 ～ 0.017 之间，给出了根据最大地表沉降量来预测最大地表倾斜量的统计关系。

Statistical analysis of characteristics of ground surface settlement caused by deep excavations in Shanghai soft soils

The characteristics of ground surface settlement caused by deep excavations in Shanghai soft soils are studied based on a database of 35 case histories.The magnitude of the maximum ground surface settlement generally increases with the increase of excavation depth.Values of the maximum ground surface settlement generally range from 0.1%H to 0.8%H,with an average value of 0.38%H,where H is the excavation depth.The maximum ground surface settlements increase with the increase of the thickness of soft soils ab...