悬挂式帷幕地铁深基坑变形特性研究

李方明; 陈国兴; 刘雪珠

doi:10.11779/CJGE201812004

悬挂式帷幕地铁深基坑变形特性研究 English Version

1. 中国地震局工程力学研究所,黑龙江哈尔滨 150080;
2. 南京工业大学岩土工程研究所,江苏南京 210009;
3. 江苏省岩土工程公司,江苏南京 210018

基金项目: 江苏省地质矿产勘查局基金项目（2015-KY-11）

详细信息

作者简介:
李方明（1975- ）,男,博士,高级工程师,主要从事地下工程防灾减灾、地下空间的开发利用、桥梁隧道与古建筑结构检测和加固工作。E-mail: 184323102@qq.com。

中图分类号: TU47;U45
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出版历程
- 收稿日期: 2017-09-24
- 发布日期: 2018-12-24

Deformation characteristics of suspended curtain deep foundation pit of metro lines

1. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;
2. Institute of Geotechnical Engineering, Nanjing Tech. University, Nanjing 210009, China;
3. Geotechnical Engineering Company of Jiangsu Province, Nanjing 210018, China

摘要

摘要: 基于江漫滩地铁深基坑的变形实测资料,采用理论分析、经验公式和有限元数值模拟方法,总结了悬挂式帷幕基坑变形规律,给类似工程设计和监测提供依据。结果表明：悬挂式帷幕基坑地表沉降曲线呈凹槽形,地表沉降考虑流固耦合作用大于不考虑流固耦合作用;地下连续墙的最终形态为内凸胀肚型,墙顶水平位移不完全是朝坑内移动,地下连续墙最大水平位移与基坑挖深的比值和全止水帷幕基坑差异不大,最大水平位移点深度位于坑底附近;由降水引起的地表沉降占总沉降量的比值约为0.54;地表沉降范围可以划分为主要影响区、次要影响区和微弱影响区;地表沉降曲线可根据影响分区选用不同的函数表达式;最大地表沉降点位置大于同等条件下全止水帷幕基坑约1.0~3.0 m。
- 悬挂式止水帷幕 /
- 地铁 /
- 江漫滩 /
- 基坑 /
- 降水 /
- 地表沉降
Abstract: Based on the actual deformation data of suspended curtain deep foundation pit of metro lines in flood plain areas, the deformation laws of the deep foundation pit are analyzed to provide a reference to the design and monitoring of similar projects by using the methods of theoretical analysis, empirical formulas and finite element numerical simulation. The results show that the distribution curve of the ground subsidence behind the suspended curtain takes a shape of groove. The ground subsidence considering fluid-structure interaction is greater than that without considering fluid-structure interaction. The final shape of the underground diaphragm wall is convex. The horizontal displacement of the wall at the top does not completely move to the pit. The ratio of the maximum horizontal displacement of the diaphragm wall to the excavation depth of the foundation pit is similar to the situation of the foundation pit with wholly used waterproof curtain. The depth of the maximum horizontal displacement point is near the bottom of the foundation pit. The ratio of the ground subsidence caused by precipitation to the total subsidence is about 0.54. The range of ground subsidence can be divided into strong, moderate and weak influence areas. The curve of ground subsidence in each influence area can thus use different functional expressions. The location of the maximum ground subsidence point is farther than that of the foundation pit with wholly used waterproof curtain about 1.0~3.0 m under the same conditions.
- suspended impervious curtain /
- metro /
- floodplain /
- foundation pit /
- precipitation /
- ground subsidence

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