深基坑地连墙支护体系动态调整方法及应用

doi:10.3785/j.issn.1008-973X.2022.02.017

浙江大学学报(工学版)

2022, Vol. 56

Issue (2): 356-367 DOI: 10.3785/j.issn.1008-973X.2022.02.017

土木与建筑工程、交通工程

深基坑地连墙支护体系动态调整方法及应用

闫腾飞1(

),陈保国1,*(

),张磊1,贺洁星1,张业勤2

1. 中国地质大学（武汉）工程学院，湖北武汉 430074
2. 中国水利水电第七工程局有限公司，四川成都 610081

Dynamic adjustment method of diaphragm wall supporting system in deep foundation pit and its application

Teng-fei YAN1(

),Bao-guo CHEN1,*(

),Lei ZHANG1,Jie-xing HE1,Ye-qin ZHANG2

1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
2. Sinohydro Bureau 7 Limited Company, Chengdu 610081, China

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摘要：

深基坑地连墙支护体系工程变形与理论设计值之间存在较大差异且难于动态调整. 采用支护结构动态调整方法解决此问题，提出动态调整方法，并运用经实测数据验证后的数值模型研究深基坑地连墙支护体系协调变形规律，得出不同调整方案下支护体系受力、变形规律及协调变形曲线（即轴力-位移关系曲线）. 基于弹性地基梁理论，给出反映支护结构动态调节思想的适用于多层支撑结构的支护体系力学解析模型. 研究发现，在工程中，更严格的位移控制不一定能够带来更安全的结果，应该寻找合理受力平衡点并将支护体系受力参数控制在最优区间内. 研究得到本工程支护体系受力参数最优区间，最大轴力与钢支撑屈服强度比值为0.32~0.38，墙体位移与开挖深度比值为0.80‰~0.92‰.

关键词： 深基坑; 地连墙; 内支撑; 动态调整; 协调变形; 土压力

Abstract:

There is a great difference between the engineering deformation value and the theoretical design value of the diaphragm wall supporting system in deep foundation pit, and it is difficult to adjust dynamically. Thus, the dynamic adjustment method of supporting structure was adopted to solve the above problem. Using the numerical model verified by the measured data, the coordinated deformation law of the diaphragm wall support system in deep foundation pit was studied, and the stress deformation law and the coordinated deformation curve of the support system with different adjustment schemes were obtained. At the same time, based on elastic foundation beam theory, an analytical model of support system mechanics that reflects the dynamic adjustment of supporting structure and is suitable for multi-layer supporting structure was put forward. It is found that it is not that more strict displacement control can get safer results in engineering, but that reasonable stress balance point should be found and the stress parameters of support system should be controlled in the optimal range. The optimal range of mechanical parameters of the supporting system was obtained. The ratio of maximum axial force to yield strength of steel support was 0.32 to 0.38, and the ratio of wall displacement to excavation depth was 0.80‰ to 0.92‰.

Key words: deep foundation pit diaphragm wall internal support dynamic adjustment coordinated deformation earth pressure

收稿日期: 2021-03-14 出版日期: 2022-03-03

CLC:

TU 476

基金资助: 国家自然科学基金资助项目（52178370）；中国地质大学（武汉）教学实验室开放基金资助项目（SKJ2019082）

通讯作者: 陈保国 E-mail: tengfei_yan@cug.edu.cn;baoguo_chen@126.com

作者简介: 闫腾飞（1995—），男，硕士生，从事城市地下空间工程研究. orcid.org/0000-0002-2268-9254. E-mail: tengfei_yan@cug.edu.cn

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引用本文:

闫腾飞,陈保国,张磊,贺洁星,张业勤. 深基坑地连墙支护体系动态调整方法及应用[J]. 浙江大学学报(工学版), 2022, 56(2): 356-367.

Teng-fei YAN,Bao-guo CHEN,Lei ZHANG,Jie-xing HE,Ye-qin ZHANG. Dynamic adjustment method of diaphragm wall supporting system in deep foundation pit and its application. Journal of ZheJiang University (Engineering Science), 2022, 56(2): 356-367.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.02.017 或 https://www.zjujournals.com/eng/CN/Y2022/V56/I2/356

图 1 钢支撑轴力伺服系统

图 2 基坑模型试验装置及模型图

图 3 支撑伸缩对支护体系受力变形特性的影响

图 4 支护体系动态调节方法流程图

图 5 基坑标准断面

表 1 地层与支护体系材料参数

图 6 深基坑数值模型示意图

表 2 地连墙与土体间接触面参数

图 7 开挖结束后支护体系受力变形特性对比曲线

图 8 S2、S3缩短10 mm方案下支护体系受力变形规律

图 9 S2~S4伸长10 mm方案下支护体系受力变形规律

表 3 支护体系动态调整工况表

图 10 不同调整方案下地连墙水平位移

表 4 各土层变形敏感值

图 11 不同调整方案下内支撑轴力

图 12 支护体系协调变形关系曲线

图 13 支护体系最佳受力点散点图

图 14 基于弹性地基梁法的计算模型示意图

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