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 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

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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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

 CLC: TU 476

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#### 引用本文:

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:

 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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