基于可靠度理论的水下大直径盾构隧道衬砌结构服役寿命预测研究  

Service Life Prediction for the Lining of a Large-Diameter Underwater Shield Tunnel Based on Reliability Theory

作　　者：李昕[1] 李健[1] 范方方[1] 拓勇飞[1] 

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430056

出　　处：《现代隧道技术》2015年第4期136-142,157,共8页Modern Tunnelling Technology

基　　金：交通部建设科技项目(2013 318 Q03 030)

摘　　要：文章依托南京纬三路水下大直径盾构隧道工程实例,针对盾构管片衬砌结构耐久性设计,展开盾构隧道衬砌结构服役寿命预测研究。基于相似法则和可靠度理论,利用蒙特卡罗法和Matlab计算程序,采用裂缝限值准则和承载力极限准则两种服役寿命的预测方法,对隧道衬砌结构进行了系统深入的研究。结果表明,假设隧道结构建成伊始即处于侵蚀环境中,并处在没有采取防护措施的最不利条件下,则服役寿命预测值在裂缝限值准则下为124年,比承载力准则下的133年小,符合裂缝满足结构适用性、承载力满足结构安全性的工程实际情况。研究结果可为今后类似水下盾构隧道耐久性设计提供理论依据。Using the Nanjing Weisan Road large-diameter underwater shield tunnel as an example and based on the similarity rule and reliability theory, a service-life prediction was carried out for the tunnel lining in light of its durability design using the Monte Carlo method, Matlab calculation program and two prediction methods： the crack limit and bearing capacity limit criteria. The results show that the lining service life is expected to be 124 years under the crack limit criterion, 9 years less than that under the bearing capacity limit criterion, if the newly built tunnel is in an erosive environment with no protection measures.This meets the requirements for structural applicability and safety regarding the crack and bearing capacity.

关 键 词：水下盾构隧道 服役寿命 碳化 氯离子侵蚀 耐久性设计 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]