摘要
针对隧道周边水土流失对隧道结构的正常运营与安全使用产生的严重影响,文章采用拟静力的试验方法对周边卸载工况下通用环错缝拼装盾构隧道结构承载能力进行了足尺试验研究,具体介绍了试验方案和加载方案的设计,提供了结构变形、裂缝展开、管片纵环缝变形和螺栓受力的发展情况以及破坏过程等试验结果,并对结构的承载性能和破坏机理进行分析。试验结果表明:结构收敛的荷载-位移曲线呈弹塑性特征,在初始阶段,荷载位移曲线线性上升;随后环缝破坏,环间相互作用减弱,结构整体刚度降低;最终环缝凹凸榫剪坏、纵缝混凝土受压破坏以及管片本体压弯破坏,结构整体失去稳定性。
Aiming at the serious effect of soil and water loss on tunnel operation and safety,full-scale quasi-static loading tests were conducted regarding the ultimate bearing capacity of staggered erected tunnel linings in unloading situation.The design of tested lining and loading schemes were introduced.The test results,including the evolution of deformation,segment crack,joint opening and bolt stress,were presented.The bearing capacity and failure mechanism of tested linings were discussed and analyzed.It shows load-displacement curve is of elastic-plastic form and the tendency of load-displacement curve is linearly rising;strength failure of circumferential joint occurs and the interaction between segments decreases,leading to decrease of integral rigidity;shearing failure of concaveconvex connector of circumferential segment joint,compression induced concrete failure of longitudinal joint and bending failure of the segment finally cause stability loss of the tunnel structure.
作者
朱瑶宏
张雨蒙
夏杨于雨
董子博
柳献
ZHU Yaohong;ZHANG Yumeng;XIA Yangyuyu;DONG Zibo;LIU Xian(Ningbo University,Ningbo 315211;Department of Geotechnical Engineering,Tongji University,Shanghai 200692;Construction Headquarters of Ningbo Rail Transit,Ningbo 310006)
出处
《现代隧道技术》
EI
CSCD
北大核心
2018年第6期152-162,169,共12页
Modern Tunnelling Technology
基金
国家自然科学基金赞助项目(51578409)
关键词
通用环
错缝拼装
盾构隧道
破坏机理
极限承载能力
足尺试验
Universal segment ring
Staggered erection
Shield tunnel
Failure mechanism
Ultimate bearing capacity
Full-scale test
