摘要
目前,盾构隧道开挖面稳定性评价方法均是确定性方法。为了考虑土体参数的变异性,提出用可靠方法来评价其稳定程度。采用数值模拟方法,研究了隧道开挖面极限支护压力。基于BP神经网络预测大量给定地层参数工况下的开挖面极限支护压力,对其进行统计,得其概率分布特征。在理论分析的基础上,结合工程实际,探讨了盾构施工土压力的确定原理。建立了隧道开挖面稳定的极限状态方程,对其进行了可靠度分析。该研究除能够科学、合理地评价开挖面的稳定程度外,对于盾构施工过程中合理地设定开挖面支护压力也具有一定的参考作用。
Research methods for excavation face stability in shield tunneling are deterministic methods at present.In order to account the variability of soil parameters,reliability method to assess tunnel excavation face stability is proposed.Limit support pressure at excavation face of shield tunneling is studied with numerical simulation.Limit support pressures with different soil parameter samples are forecasted by BP neural network.Then the probability distribution of them is gained.Principle of determining the earth pressure during tunnel excavation by use of earth pressure balance shield machine is discussed theoretically and practically.Limit state equation of excavation face stability in shield tunneling is established.Excavation face stability is calculated with reliability method.The work not only can assess excavation face stability rationally,but also is significance to determine the support pressure scientifically.
作者
李志华
华渊
周太全
孙秀丽
LI Zhi-hua;HUA Yuan;ZHOU Tai-quan;SUN Xiu-li(School of Environmental and Civil Engineering,Jiangnan University,Wuxi 214122,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第S01期315-319,共5页
Rock and Soil Mechanics
关键词
盾构隧道
开挖面
稳定性
可靠度
shield tunnel
excavation face
stability
reliability
作者简介
李志华,男,1976年生,工学博士,主要从事隧道施工力学、可靠度评估方面的教学和研究工作。E-mail:lizhhdlut@yahoo.com.cn
