摘要
文章基于深圳地铁错缝拼装盾构隧道的复杂荷载条件,结合足尺结构试验及结构分析模型,研究了复杂荷载条件下盾构隧道结构的受力性能,探索了外界复杂荷载条件与结构性能之间的相互关系,尝试提出了工程实际可用的基于外界荷载、结构响应的结构安全指标。结果表明:错缝拼装盾构隧道结构破坏机制遵循"管片开裂"→"纵缝刚度下降"→"内力重分布,比例极限"→"管片出现钢筋屈服"→"出现纵缝螺栓屈服,弹塑性极限"→"长期处于塑性,结构严重破损,极限状态"的发展规律。对应比例极限、出现钢筋屈服、弹塑性极限3个关键性能点,可提出涵盖隧道外荷载、内部表观现象、内部实测数据三大方面内容的三阶段结构安全指标。
Based on the complex load conditions of a stagger-jointed subway shield tunnel,a full-scale structural test and a FEM structural analysis model are used to study the mechanical performances of the shield tunnel structure under the condition mentioned above,trying to put forward the structural safety indexes based on the correlation between external load and structural response.The research shows that the failure mechanism of staggerjointed shield tunnel structure follows the sequence:e.g.segment cracking→stiffness reduction of the longitudinal joint→internal force redistribution,proportional limit→yielding of the steel bar→yielding of the longitudinal joint bolt,the elastoplastic limit→the long term plastic state,the serious damage of the structure and the limit state.Corresponding to the 3 key performance points(proportional limit,steel bar yield and elastoplastic limit),the three stage structure safety indexes including external load of tunnel,internal apparent phenomena and internal measured data can be put forward.
作者
王康任
庞小朝
刘树亚
柳献
WANG Kangren;PANG Xiaochao;LIU Shuya;LIU Xian(China Academy of Railway Sciences Shenzhen Research and Design Institute, Shenzhen 518000;Shenzhen Metro Group Co. ,Ltd,Shenzhen 518000;Department of Geotechnical Engineering,Tongji University,Shanghai 200092)
出处
《现代隧道技术》
EI
CSCD
北大核心
2018年第A02期588-598,共11页
Modern Tunnelling Technology
基金
中国铁道科学研究院基金项目(2016YJ157)
自然科学基金(51578409).
关键词
错缝拼装盾构隧道
复杂荷载条件
结构受力性能
结构安全指标
Stagger-jointed shield tunnel
Complex load condition
Mechanical performance
Structural safety index
