上海软土基坑板式支护结构稳定性可靠度分析

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摘要在现行上海基坑规范规定的验算模式下,对基坑板式支护结构分别建立了整体稳定、抗隆起稳定、抗倾覆稳定极限状态方程。采用结构可靠度理论来研究板式支护结构的稳定可靠度问题,考虑了影响支护结构稳定性的主要随机变量（黏聚力c,内摩擦角φ）的变异性,用概率来度量支护结构的稳定可靠度。通过一次二阶矩法（JC法）对上海6个基坑工程进行可靠性分析计算,得到规范要求安全系数下,各种失稳模式所对应的可靠性指标值及其变化范围和变化趋势,并确定了各验算模式的目标可靠性指标；研究结果为基坑工程的可靠性评价提供一定的理论依据,并为进一步确定基坑工程的设计分项系数提供必备的基础。

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	秦高峰
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关键词 ：板式支护, 基坑工程, 极限状态方程, 可靠性指标

Abstract：Under the design methods recommended by Shanghai standard code for design of excavation engineering, the ultimate state equations for the overall stability, basal heave stability and overturning stability of flexible retaining structure of excavations are establisbed. Considering the variability of variables (mainly cand φ), the reliability of the supporting structure of the excavations are calculated. By applying this method (FOSM method or JC method) to six excavation cases of Shanghai soft soils, the range of the stable reliability index of an excavation pit and the variation tendency of the reliability index are concluded. The target reliability index of the excavation cases in Shanghai soft soils are proposed. The results may provide a theoretical basis for the reliability evaluation of practical excavations and a basis for the determination of partial factor of the excavation.

Key words： flexible retaining structure excavation engineering limit state equation reliability index

收稿日期: 2013-07-19

TU476.4

基金资助:上海现代建筑设计（集团）有限公司科研项目（11-1类

作者简介: 秦高峰(1988- )，男，河南驻马店人，硕士研究生，主要从事基坑工程可靠度方面的学习与研究工作。E-mail: qingaofeng1618@163.com。

引用本文:

秦高峰, 李镜培, 刘陕南, 侯胜男. 上海软土基坑板式支护结构稳定性可靠度分析[J]. 岩土工程学报, 2013, 35(zk2): 532-536. QIN Gao-feng, LI Jing-pei, LIU Shan-nan, HOU Sheng-nan. Reliability of flexible retaining structure of excavations in Shanghai soft soils. Chinese J. Geot. Eng., 2013, 35(zk2): 532-536.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2013/V35/Izk2/532

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