摘要
针对周边卸载工况下通缝拼装盾构隧道衬砌结构的失效机制,提出拟静力试验方法,并完成衬砌结构抗倒塌性能足尺试验。基于试验成果与现象,对衬砌结构受力全过程进行分析,并对衬砌结构的破坏模式、极限承载力和整体安全度进行分析讨论。通过试验和计算得出结论:意外事件下衬砌结构的破坏属梁铰机制,当结构体系出现足够多塑性铰时,利用虚功原理可预估衬砌结构的极限承载力。采用结构的荷载储备比作为安全指标,周边卸载工况下衬砌结构整体安全系数可达到1.62。
For the failure mechanism of straight joint shield tunnel lining structure under side-unloading conditions,a quasi-static test method is proposed. And a full-scale test of anti-collapse property is completed. Based on the test results and phenomena,the whole bearing process of lining structure were analyzed. The failure mode,ultimate bearing capacity and overall safety of lining structure were discussed. Through experiments and calculations:the failure of lining structure is a beam hinge mechanism,while sufficient plastic hinges appear,the ultimate bearing capacity of the structure can be estimated by virtual work theory. Using load reserve ratio as a safety indicator,the overall safety factor of lining structure under side-unloading conditions is 1.62.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第S2期3703-3714,共12页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51578409)
关键词
隧道工程
抗倒塌性能
整体安全度
足尺试验
tunnelling engineering
collapse capacity
robustness
full-scale test
