浅埋圆形隧道开挖面稳定的可靠度分析
摘要:开挖面支护压力是影响隧道开挖面稳定的重要施工因素,也是进行隧道开挖稳定性可靠度分析的关键。采用FLAC3D软件计算开挖面的最小极限支护压力,结合响应面法计算浅埋圆形隧道开挖面稳定的可靠度指标β,将土体粘聚力和内摩擦角作为随机变量,考虑土体粘聚力和内摩擦角之间的相关性。分析结果表明,不考虑参数相关性计算得到的可靠性指标偏于保守。通过计算验算点处的极限支护压力与原支护压力比较,证明响应面法在结合FLAC3D计算开挖面稳定的可靠度方面是足够准确的。
Abstract:Support pressure is a significant factor which influences on stability of excavation face in a shallow circular tunnel driven by a pressurized shield, which is also a key point in reliability analysis. FLAC3D simulation and response surface methodology is utilized for the reliability index β for ultimate state. Both soil shear strength parameters are considered as random variables as the ultimate state studying and also taking into account the statistical correlation between cohesion and internal friction angle. Finally, the assumption of uncorrelated variables was found conservative in comparison to the assumption of negatively correlated variables.
中文标题：
浅埋圆形隧道开挖面稳定的可靠度分析
Analysis on Reliability of Excavation Face Stability in Shallow Circular Tunnel
作者：
王俊峰,高广运,张蕾
Wang Junfeng,Gao Guangyun,Zhang Lei
作者简介:王俊峰,1986年生,男,安徽人,硕士研究生,主要从事岩土工程与地下工程研究。E-mail:wjf2005huo@163.com
通讯地址：
同济大学岩土及地下工程教育部重点实验室, 上海 200092
KeyLaboratoryofGeotechnicalandUndergroundEngineeringofMinistryofEducation,TongjiUnivesity,Shanghai200092,China
中图分类号:TU941
doi:10.3969/j.issn.1007-2993.2011.01.011
出版物：岩土工程技术
收稿日期:2010-09-25
关键词:盾构隧道,极限支护压力,开挖面稳定性,可靠度
Key words:shield tunnel,tunnel collapse pressure,FLAC3D,stability
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基金项目：
基金项目: 上海市重点学科建设资助项目(B308)
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