基于可靠度理论的铁路隧道洞门极限状态设计方法

发布时间：2018-01-24 17:52

本文关键词： 隧道工程隧道洞门极限状态设计方法可靠度　出处：《西南交通大学学报》2016年01期 　论文类型：期刊论文

【摘要】：针对铁路隧道洞门结构稳定性极限状态功能函数具有非线性及其参数具有随机性的特点,提出了基于可靠度理论的铁路隧道洞门结构设计方法.通过分析铁路隧道洞门的极限状态,建立了其极限状态方程.基于可靠度理论,以时速140 km/h的单线电气化铁路隧道端墙式洞门可靠指标计算为例,根据采用同样方法对3种设计时速共16种形式、22种类别隧道洞门的可靠指标计算结果,确定各极限状态下的目标可靠指标,建立极限状态设计式,求解并优化抗力分项系数.研究结果表明:铁路隧道洞门主要有抗裂、抗压、倾覆、滑动和地基承载力不足5种极限状态;极限状态方程中基本随机变量的统计特征是铁路隧道洞门可靠度设计是否准确的关键,可靠指标的确定是洞门结构极限状态设计的核心;建立的极限状态设计方法可直接用于铁路隧道洞门结构设计.
[Abstract]:In view of the nonlinear function of the stability limit state function of railway tunnel portal structure and the randomness of its parameters. The design method of railway tunnel portal structure based on reliability theory is put forward. The limit state equation of railway tunnel portal is established by analyzing the limit state of railway tunnel portal. Taking the calculation of reliability index of end-wall portal of single-line electrified railway tunnel with speed of 140 km/h as an example, this paper uses the same method to calculate 16 kinds of design speed of three kinds of design speed. The reliability index of 22 kinds of tunnel door is calculated, and the target reliability index under each limit state is determined, and the limit state design formula is established. The results show that the railway tunnel door has five kinds of limit states, such as crack resistance, compression resistance, overturning, sliding and foundation bearing capacity. The statistical characteristic of basic random variables in the limit state equation is the key to the reliability design of railway tunnel portal, and the determination of reliability index is the core of the limit state design of tunnel structure. The limit state design method can be directly used in the structure design of railway tunnel portal.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;
【基金】：中国铁路总公司科技研究开发计划资助项目(2012G014-D)
【分类号】：U452.2
【正文快照】： 隧道洞门结构与周围岩土之间的相互作用关系复杂、岩土工程性质不确定性等[1],使得隧道洞门可靠性研究难度大.张清等提出了与地面结构相似的铁路隧道衬砌结构可靠度分析方法[2].景诗庭介绍了地下结构可靠度分析研究的进展[3].谭忠盛、高波等提出了基于有限单元法求解偏压隧道

【共引文献】