铁路隧道衬砌结构分项系数的优化分析研究

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摘要研究目的:采用带有分项系数的实用设计表达式，不仅能继承传统结构设计式的形式，而且能体现结构设计对目标可靠指标的要求，是应用可靠指标衡量结构设计安全水平的重要途径。本文根据铁路隧道衬砌结构的受力特点和材料性能，采用混凝土衬砌结构抗压、混凝土衬砌结构抗裂和钢筋混凝土衬砌结构三种极限状态设计式建立“荷载-结构”模型。

研究结论:利用Monte一Carlo随机有限元的方法分析铁路隧道衬砌结构作用效应的统计特征，根据材料特性分析抗力的概率统计特征以及计算可靠指标与目标可靠指标差值最小化的原则，分析得到:(1)铁路隧道衬砌结构检算时，围岩压力分项系数为1.4，自重荷载分项系数为1.2;(2)钢筋混凝土、混凝土抗压、混凝土抗裂三种工况下的调整系数分别为1.05,1.85,2.35;(3)该研究结果可为《铁路隧道设计规范》的修订提供理论依据。

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	喻渝
	赵东平
	宋玉香
	张晓静
	齐键旭

关键词 ：隧道衬砌结构, 极限状态设计式, 分项系数优化

Abstract：Research purposes:The practical design expression with a partial coefficient，not only inherited the form of traditional structural design，but also reflected the structural design requirements for the target reliability index. It is the important way to measure the level of structure security with application of a reliable indicator. According to the stress characteristics and material properties of railway tunnel lining structure，the load-structure model is established using the three kinds of limit states design equations of the compressive concrete lining structure，the anti一cracking concrete lining structure and reinforced concrete lining structure.

Research conclusions:The statistical characteristic of railway tunnel lining structure effect is analyzed using Monte-Carlo stochastic finite element method，according to the probability statistical characteristics of material characteristic resistance and difference minimization principle between the calculated reliability index and the target reliability index，the following conclusions are analyzed:(1)The railway tunnel lining structure is checked，the surrounding rock pressure partial coefficient is 1 .4，gravity loads partial coefficient is 1 .2.(2)The three kinds of adjustment coefficients of reinforced concrete，concrete compressive strength，concrete anti一cracking coefficient are 1 .OS，1 .85，2. 35.(3)The calculation results can provide theoretical basis for the railway tunnel design equations;partial coefficient code revision.

Key words： tunnel lining structure limit states design optrmizatron

基金资助:铁道部科技研究开发项目(20126014 - D);中国中铁股份有限公司科研项目[13164174(12一14)]

作者简介: 喻渝，1967年出生，男，教授级高级工程师

引用本文:

喻渝，赵东平，宋玉香，张晓静，齐键旭. 铁路隧道衬砌结构分项系数的优化分析研究[J]. 铁道工程学报, 2015, 32(6): 57-61.
YU Yu，ZHAO Dong一ping`，SONG Yu一xiangZ,ZHANG Xiao一jingz，QI Jianxu. Analysis of Partial Coefficient Optimization of Lining Structure in Railway Tunnel. Journal of Railway Engineering Society, 2015, 32(6): 57-61.

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https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2015/V32/I6/57

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