深埋隧道素混凝土衬砌可靠度计算模型研究  

Study on reliability calculation model of plain concrete liner in deep-buried tunnels

作　　者：李奎[1] 赵东平[1] 路军富[1] 

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《铁道建筑》2014年第7期38-42,共5页Railway Engineering

基　　金：铁道部科技研究开发计划项目(2012G014-A-4);中铁二院院控项目[院计划13164174(12-14)]

摘　　要：采用拉丁超立方抽样技术,研究了围岩压力及结构自重作用下基于荷载—结构模型的素混凝土衬砌可靠度计算模型、作用效应及结构抗力的分布类型和统计特征。隧道衬砌的功能函数可归纳为作用效应和结构抗力两个综合随机变量。研究结果表明,作用效应和结构抗力的概率分布类型直接影响到衬砌可靠度指标计算方法和计算结果的合理性。根据经验判断,隧道素混凝土衬砌的作用效应的概率分布类型为正态分布,结构抗力的概率分布类型可能是正态分布,也可能是对数正态分布。隧道衬砌可靠度指标计算时需要严格判断各截面的抗力分布类型。This paper studied the reliability calculation model of plain concrete lining,probability distribution types and statistical characteristics of action effect and structural resistance based on load-structure model under the role of rock pressure and structure weight by adopting Latin hypercube sampling technique. Performance function of tunnel lining can be summarized as two integrated random variables of action effect and structural resistance. The results showed that probability distribution types of action effect and structural resistance directly affect calculation methods of lining reliability indices and rationality of the results. The action effect probability distribution type of tunnel plain concrete lining is normal distribution according to the experience,and the structural resistance probability distribution type may be normal distribution or lognormal distribution. Structural resistance probability distribution type of each cross-section must be determined strictly when reliability index of tunnel lining was calculated.

关 键 词：深埋隧道 可靠度计算模型 功能函数综合变量模拟法 拉丁超立方抽样 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]