复杂荷载条件下错缝拼装盾构隧道受力性能及结构安全指标研究
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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.
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.
引文
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[3]刘钊.复杂工况条件下错缝拼装盾构管片变形性能试验与仿真分析研究[D].北京:中国铁道科学研究院,2017.LIU Zhao. Deformation Performance Test and Simulation Analysis of Staggered Shield Tunnel Segments under Complex Working Conditions[D]. Beijing:China Academy of Railway Sciences,2017.
[4] M B C B, J V H E,S J P. Three-dimensional Structural Analyses of the Shield-driven"Green Heart"tunnel of the High-speed Line South[J]. Tunneling and Underground Space Technology, 1999,14(2):217-224
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[8]柳献,张晨光,张宸.地铁盾构隧道纵向接缝承载能力试验研究与解析分析[J].土木工程学报,2016,(10):110-122.LIU Xian,ZHANG Chenguang, ZHANG Chen. Experimental Study and Analytical Analysis of Bearing Capacity of Longitudinal Joints of Metro Shield Tunnel[J]. China Civil Engineering Journal,2016,(10):110-122.
[9]朱瑶宏,张宸,柳献,等.错缝拼装通用环管片环缝抗剪性能试验研究[J].铁道科学与工程学报,2017,14(2):315-324.ZHU Yaohong,ZHANG Chen, LIU Xian,et al. Experimental Study on Shear Property of Circumferential Joint in General Ring Segment under the Staggered Assembling[J]. Journal of Railway Science and Engineering,2017,14(2):315-324.
[10]北京城建设计研究总院有限责任公司.地铁设计规范:GB 50157-2013[S].中国建筑工业出版社,2014.Beijing Urban Construction Design and Research Institute Co., Ltd. Metro Design Specification:GB 50157-2013[S]. China Building Industry Press,2014.
[11]中华人民共和国住房和城乡建设部.盾构法隧道施工与验收规范:GB 50446-2017[S].中国建筑工业出版社,2017.Ministry of Housing and Urban-Rural Development of the People's Republic of China. Code for Construction and Acceptance of Shield Tunnels:GB 50446-2017[S]. China Building Industry Press,2017.
[12]王如路,张冬梅.超载作用下软土盾构隧道横向变形机理及控制指标研究[J].岩土工程学报,2013,35(6):1092-1101.WANG Rulu,ZHANG Dongmei. Study on Lateral Deformation Mechanism and Control Index of Soft Soil Shield Tunnel under Overload[J]. Chinese Journal of Geotechnical Engineering,2013,35(6):1092-1101.
[13]张旭辉,杨志豪,洪弼宸,等.盾构隧道结构健康评价的变形指标研究[J].地下工程与隧道,2014,(4):7-13.ZHANG Xuhui,YANG Zhihao,HONG Bichen,et al. Research on Deformation Index of Shield Tunnel Structure Health Evaluation[J]. Underground Engineering and Tunnel, 2014,(4):7-13.
[2]邵华,黄宏伟,张东明,等.突发堆载引起软土地铁盾构隧道大变形整治研究[J].岩土工程学报,2016,38(6):1036-1043.SHAO Hua,HUANG Hongwei,ZHANG Dongming,et al. Study on Large Deformation Rectification of Iron Shield Tunnel in Soft Soil Caused by Sudden Surcharge[J]. Chinese Journal of Geotechnical Engineering,2016,38(6):1036-1043.
[3]刘钊.复杂工况条件下错缝拼装盾构管片变形性能试验与仿真分析研究[D].北京:中国铁道科学研究院,2017.LIU Zhao. Deformation Performance Test and Simulation Analysis of Staggered Shield Tunnel Segments under Complex Working Conditions[D]. Beijing:China Academy of Railway Sciences,2017.
[4] M B C B, J V H E,S J P. Three-dimensional Structural Analyses of the Shield-driven"Green Heart"tunnel of the High-speed Line South[J]. Tunneling and Underground Space Technology, 1999,14(2):217-224
[5] Luttikholt A J T,Vervuurt A H J M,Uijl J A D. Ultimate Limit State Analysis of a Segmented Tunnel Lining[R]. Ultimate Limit State Analysis of a Segmented Tunnel Lining Tno Repository,2007.
[6]毕湘利,柳献,王秀志,等.通缝拼装盾构隧道结构极限承载力的足尺试验研究[J].土木工程学报,2014,(10):117-127.BI Xiangli,LIU Xian, WANG Xiuzhi,et al. Experimental Investigation on the Ultimate Bearing Capacity of Continuous-jointed Seqmental Tunnel Linings[J]. China Civil Engineering Journal,2014,(10):117-127.
[7]鲁亮,孙越峰,柳献,等.地铁盾构隧道足尺整环结构极限承载能力试验研究[J].结构工程师,2012,28(6):134-139.LU Liang,SUN Yuefeng,LIU Xian,et al. Full-ring Experimental Study on the Ultimate Bearing Capacity of the Lining Structure of the Metro Shield Tunnel[J]. Structural Engineers,2012,28(6):134-139.
[8]柳献,张晨光,张宸.地铁盾构隧道纵向接缝承载能力试验研究与解析分析[J].土木工程学报,2016,(10):110-122.LIU Xian,ZHANG Chenguang, ZHANG Chen. Experimental Study and Analytical Analysis of Bearing Capacity of Longitudinal Joints of Metro Shield Tunnel[J]. China Civil Engineering Journal,2016,(10):110-122.
[9]朱瑶宏,张宸,柳献,等.错缝拼装通用环管片环缝抗剪性能试验研究[J].铁道科学与工程学报,2017,14(2):315-324.ZHU Yaohong,ZHANG Chen, LIU Xian,et al. Experimental Study on Shear Property of Circumferential Joint in General Ring Segment under the Staggered Assembling[J]. Journal of Railway Science and Engineering,2017,14(2):315-324.
[10]北京城建设计研究总院有限责任公司.地铁设计规范:GB 50157-2013[S].中国建筑工业出版社,2014.Beijing Urban Construction Design and Research Institute Co., Ltd. Metro Design Specification:GB 50157-2013[S]. China Building Industry Press,2014.
[11]中华人民共和国住房和城乡建设部.盾构法隧道施工与验收规范:GB 50446-2017[S].中国建筑工业出版社,2017.Ministry of Housing and Urban-Rural Development of the People's Republic of China. Code for Construction and Acceptance of Shield Tunnels:GB 50446-2017[S]. China Building Industry Press,2017.
[12]王如路,张冬梅.超载作用下软土盾构隧道横向变形机理及控制指标研究[J].岩土工程学报,2013,35(6):1092-1101.WANG Rulu,ZHANG Dongmei. Study on Lateral Deformation Mechanism and Control Index of Soft Soil Shield Tunnel under Overload[J]. Chinese Journal of Geotechnical Engineering,2013,35(6):1092-1101.
[13]张旭辉,杨志豪,洪弼宸,等.盾构隧道结构健康评价的变形指标研究[J].地下工程与隧道,2014,(4):7-13.ZHANG Xuhui,YANG Zhihao,HONG Bichen,et al. Research on Deformation Index of Shield Tunnel Structure Health Evaluation[J]. Underground Engineering and Tunnel, 2014,(4):7-13.