摘要
盾构隧道衬砌结构的变形与破坏模式受接头的力学性能控制,但目前国内地铁盾构隧道接头形式多样,不同形式的接头对整环结构受力性能的影响机理还不清晰。基于足尺试验,分别研究单环、多环的国内典型地铁直螺栓接头衬砌结构、弯螺栓接头衬砌结构、快速接头衬砌结构的受力性能,对比分析其正常运营状态的变形、周边扰动下的破坏模式与极限承载力。结果表明:①通缝拼装盾构隧道衬砌结构的性能由纵缝接头性能决定,提高纵缝接头延性可使结构破坏模式从接头处连接件脆性断裂转变为结构整体失稳;②错缝结构性能取决于环间相互作用强弱,随着环间相互作用的增强,结构首个塑性铰位置从纵缝接头向管片本体转移;③可通过环间、环内的协调设计,优化结构正常运营状态基本受力性能,提高结构极限承载力并使结构发生延性破坏。
It has been widely accepted that the deformation and failure mechanism of segmental tunnel linings are governed by the behavior of joints.However, it was still not clear yet how the local behaviors of joints affect the overall behavior of segmental tunnel linings.In order to investigate the overall behavior of segmental linings with different types of joints, five groups of full-scale tests were carried out.Three types of longitudinal joints were considered, including joints connected with straight bolts, joints connected with bent bolts and joints connected with fast-slide connector, respectively.Two types of circumferential joints were considered, including joints with tongue-and-groove structure and plate joints.The progressive failure and ultimate bearing capacity of segmental linings assembled with both single ring and triple-ring system were captured under the designed loading situation.The results indicated that:(1) The failure mode of cross-jointed segmental tunnel linings depends on the ductility of joints.After the ductility of the longitudinal joint connector is improved, the failure mode of structure may transit from the brittle failure of joint connector to the overall instability failure of structure.(2) Failure of the stagger-jointed segmental tunnel linings depends on the interaction between rings.With the increase of the interaction between rings, the first plastic hinge tends to develop in the segments rather than in the longitudinal joint connectors.(3) The performance of segmental linings may be improved by adjusting the stagger effect through the coordinated designs of the single ring stiffness and the circumferential joint shear stiffness.
作者
柳献
张雨蒙
王如路
Liu Xian;Zhang Yumeng;Wang Rulu(Tongji University,Shanghai 200092,China;Shanghai Shentong Metro Group Co.,Ltd.,Shanghai 201102,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2020年第5期118-128,共11页
China Civil Engineering Journal
基金
国家重点研发计划资助(2017YFC0805004)
国家自然科学基金资助项目(51578409)。
关键词
盾构隧道
足尺试验
受力性能
破坏模式
极限承载力
协调设计
shield tunnel
full-scale test
mechanical behavior
failure mode
ultimate bearing capacity
coordinated design
