基于随机有限元理论的连拱隧道结构可靠性分析  

Reliability Analysis of Multi-arch Tunnel Lining Structure Based on Stochastic Finite Element Theory

作　　者：马云锋[1] 唐前松[1] 周勇[1] 陈赟[2] 

机构地区：[1]湖南省高速公路管理局,湖南长沙410001 [2]长沙理工大学交通运输工程学院,湖南长沙410004

出　　处：《矿冶工程》2012年第6期5-8,共4页Mining and Metallurgical Engineering

基　　金：湖南省教育厅科研资助计划项目重点项目(11A010);湖南省交通运输厅2009年度科技进步与创新计划项目(200925)

摘　　要：应用基于神经网络的随机有限元方法,把截面抗压强度条件视为承载能力的极限状态,把截面受拉开裂条件视为正常使用的极限状态,进行某高速公路连拱隧道衬砌结构可靠性分析,得出了衬砌结构可靠度指标的分布规律和衬砌结构的概率破坏规律。按照抗压条件计算,衬砌结构的最小可靠度指标位于拱墙的侧部,而最大可靠度指标位于拱顶部位,说明隧道衬砌结构的受压破坏容易发生在拱墙的侧部;按照衬砌结构的抗裂条件计算,衬砌结构的最小可靠度指标位于拱顶部位,而最大可靠度指标位于拱墙的侧部,说明隧道衬砌结构的受拉破坏容易从拱顶部位开始,而拱墙侧部产生受拉开裂的可能性较小。Based on stochastic finite element method,reliability analysis was conducted for lining structures of some multi-arch highway tunnel,by taking compressive strength condition of cross section as the limit state for load-bearing capacity and the tensile cracking condition of the cross section as a normal limit state.As a result,the rule of reliability index and failure probability for lining structures was obtained.Based on the calculation in terms of the compressive strength,the minimum value of reliability index falls on the sidewall of the arch while the maximum value at the arch crown,indicating that the compressive failure of the lining structure is prone to occur at the sidewall of the arch.On the contrary,calculation in terms of anti-cracking condition shows the maximum value of the reliability index on the sidewall and the minimum value at the arch crown,indicating that the tensile failure of lining structure of tunnel tends to be start from the arch crown.

关 键 词：连拱隧道 衬砌结构 随机有限元 可靠性分析 神经网络 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]