环形超深基坑围护结构受力变形特性分析

›› 2011, Vol. 32 ›› Issue (2): 617-622.

环形超深基坑围护结构受力变形特性分析

罗耀武^{1, 2}，凌道盛¹，陈云敏¹，胡琦³，陈峥⁴

1.浙江大学，软弱土与环境土工教育部重点实验室，杭州 310027；2.黄河勘测规划设计有限公司，郑州 450003； 3.浙江工业大学，杭州 310014；4.华东电力设计院，上海 200063

收稿日期:2009-07-03 出版日期:2011-02-10 发布日期:2011-02-16
通讯作者: 胡琦，男，1978年生，博士，主要从事桩基工程与深基坑工程的研究。 E-mail:huqi@zju.edu.cn
作者简介:罗耀武，男，1982年生，博士，主要从事桩基工程与深基坑工程的研究。

Mechanical and deformation characteristics of enclosure structure for annular extra-deep excavation

LUO Yao-wu ^{1, 2}, LING Dao-sheng¹, CHEN Yun-min¹, HU Qi3, CHEN Zheng⁴

1. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Education Ministry, Zhejiang University, Hangzhou 310027, China; 2. Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003, China; 3. Zhejiang University of Technology, Hangzhou 310014, China; 4. East China Electric Power Design Institute, Shanghai 200063, China

Received:2009-07-03 Online:2011-02-10 Published:2011-02-16

摘要/Abstract

摘要：

结合上海世博500 kV变电站超深基坑实际工程，采用平面应变及轴对称弹性地基有限元分析模型对基坑围护结构的空间效应进行简化，分析了环形基坑空间效应、内衬墙以及水土压力模式对围护结构受力变形特性的影响，并与实测结果进行比较。结果表明，环形基坑围护结构的空间效应对其受力变形特性影响很大，在计算过程中必须考虑围护结构环向刚度对径向刚度的贡献；内衬墙作用类似于环形支撑，对地下连续墙受力及变形是有利的；地下连续墙水平位移实测值最接近于侧压力系数1.0的轴对称有限元分析结果；地下连续墙环向应力和弯矩实测值位于按规范水土分算与侧压力系数1.0的轴对称有限元计算结果之间。

关键词: 环形超深基坑, 围护结构

Abstract:

Based on the deep excavation of Shanghai 2010 Exposition 500 kV substation, the plane strain and axisymmetric elastic foundation FEM are used to simplify the space effect of the enclosure structure. The space effect of the annular enclosure structure, the inner liner and the different water and soil pressure distribution model are considered for the mechanical and deformation characteristics of enclosure structure. Through comparision between the calculated and measured results, several results are obtained: the space effect of the annular enclosure structure has a great influence on the mechanical and deformation characteristics of it; the ring stiffness of the enclosure structure must be considered during calculation; the inner liner is beneficial to the mechanical and deformation of the diaphragm wall, like a ring supporting; the measured horizontal displacement of the diaphragm wall is close to the result of axisymmetric finite element analysis when lateral pressure coefficient is 1.0; the measured hoop stress and bending moment of diaphragm wall are between the result of estimating water and earth pressure separately and lateral pressure coefficient is 1.0.

Key words: annular extra-deep excavation, enclosure structure

中图分类号:

TU 753

罗耀武，凌道盛，陈云敏，胡琦，陈峥. 环形超深基坑围护结构受力变形特性分析[J]. , 2011, 32(2): 617-622.

LUO Yao-wu, LING Dao-sheng, CHEN Yun-min, HU Qi, CHEN Zheng. Mechanical and deformation characteristics of enclosure structure for annular extra-deep excavation[J]. , 2011, 32(2): 617-622.

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