上海地区深基坑周边地表变形性状实测统计分析

王卫东; 徐中华; 王建华

上海地区深基坑周边地表变形性状实测统计分析 English Version

（ 1. 华东建筑设计研究院地基基础与地下工程设计研究所，上海 200002 ； 2. 上海交通大学土木工程系，上海 200030 ）

详细信息

作者简介:
王卫东 (1969 – ) ，男，辽宁辽阳人，博士，教授级高级工程师，主要从事基坑及桩基的设计与研究工作。

中图分类号: TU476
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出版历程
- 收稿日期: 2012-01-05
- 发布日期: 2011-11-14

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

(1. Department of Underground Structure & Geotechnical Engineering, East China Architectural Design & Research Institute Co., Ltd., Shanghai 200002, China; 2. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200030, China)

摘要

摘要: 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。
- 深基坑 /
- 地表沉降 /
- 统计分析 /
- 软土
Abstract: 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 above wall toe, but decrease with the increase of the factor of safety against basal heave. The maximum ground surface settlement is independent of the system stiffness of the retaining system and the embedded depth ratio of retaining wall. The lower and upper bound values of the ratio between the maximum ground surface settlement and the maximum lateral displacement of wall are 0.4 and 2.0, respectively, with an average value of 0.84. Distribution of the ground settlement is analyzed. The upper bounds of the ground settlement profiles are proposed for the case histories in Shanghai. The maximum ground surface distortion ranges from 0.001 to 0.017. Relationship between the maximum ground surface distortion and the maximum ground surface settlement is also established.
- deep excavation /
- ground settlement /
- statistical analysis /
- soft clay

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参考文献(23)

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