首页期刊在线 2023年（第26卷）第3期

软土区地铁车站基坑取消换撑可行性分析研究

叶如1申文明2景浩1王小刚2王晨竹2董毓庆3张在恒4

Feasibility Analysis of Cancelling the Support Replacement of Metro Station Foundation Pit in Soft Soil Area

YE RuSHEN WenmingJING HaoWANG XiaogangWANG ChenzhuDONG YuqingZHANG Zaiheng

作者信息:

1.1.宁波市轨道交通集团有限公司， 315101，宁波；
2.2.中铁二院华东勘察设计有限责任公司， 315175，杭州;
3.3.杭州岩通科技有限责任公司， 310005，杭州；
4.4.宁波市岩土工程有限公司， 315012，宁波
Affiliation:

Ningbo Rail Transit Group Co.， Ltd., 315101, Ningbo, China
关键词:

地铁车站;深基坑;换撑;软土地区;实测分析
Key words:

metro station;deep foundation pit;support replacement;soft soil area;field measurement analysis
DOI:

10.16037/j.1007-869x.2023.03.016
中图分类号/CLCN:

TV551.4+2∶U231.4
栏目/Col:

研究报告

摘要:

为深入研究软土地区地铁车站深基坑中取消换撑的可行性和实际决策过程中所需要考虑的工程因素，依托现场实测数据，探究基坑变形的变化规律，总结有换撑区段与无换撑区段的变形差异，提出地铁车站基坑取消换撑的可行性建议。研究结果表明：不同的环境因素会导致基坑地下连续墙和地表沉降呈现出不同的变形规律及幅度；在实际工程中，应根据实际工程地质、施工工况、监测数值并结合变形计算或有限元模拟等初期计算结果综合判断深层土体应力释放变形是否充分，从而决定是否取消换撑，同时对于存在复杂环境因素或较多不利因素的截面应该保留换撑，以防后续产生无法预测的测斜量激增。

Abstracts:

To study in-depth the feasibility of cancelling the support replacement of metro station deep foundation pit in soft soil area and the engineering factors to be considered in the actual decision-making process, by referring to field measurement data, the foundation pit deformation law is studied. The deformation difference between the sections with and without support replacement is summarized, and suggestions on the feasibility of cancelling the support replacement is put forward. The results show that different environmental factors will cause different deformation laws and amplitudes of the foundation pit underground diaphragm wall and land subsidence. In actual engineering cases, whether the stress release and deformation of the deep soil are sufficient to cancel the support replacement should be comprehensively judged by the actual engineering geology, construction conditions, monitoring data, combined with deformation calculations, finite element simulation and other initial calculation results. At the same time, the support replacement method should be reserved for the sections with complex environmental factors or unfavorable factors to prevent the unpredictable sharp inclination increment as a result.