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《狮子洋水下盾构隧道衬砌结构受力的现场测试与计算分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第34卷第7期铁道学报Vol.34No.72012年7月JOURNALOFTHECHINARAILWAYSOCIETYJuly2012文章编号:1001-8360(2012)07-0115-07狮子洋水下盾构隧道衬砌结构受力的现场测试与计算分析周济民1,何川1,肖明清1,2,宋洪江3(1.西南交通大学隧道工程教育部重点实验室,四川成都610031;2.中铁第四勘察设计院集团有限公司,湖北武汉430063;3.成都铁路局成昆铁路公司,四川成都610081)摘要:以狮子洋水下盾构隧道为背景,对管片衬砌在施工期和后
2、期所受外荷载和结构内力进行长期现场追踪测试,总结衬砌结构外荷载和内力随时间变化规律。并采用三维壳-弹簧计算模型对大断面宽幅管片结构内力分布形态进行研究,与现场测试结果相互验证。研究结果表明:施工期管片衬砌脱环后容易形成无水压环箍作用下土体偏压状态;施工后期水、土压力长期随时间增长,结构内力随之增大,结构轴力较弯矩增幅明显。三维壳-弹簧计算模型适应大断面宽幅管片衬砌结构计算。试验和数值计算结果在量值和分布规律上一致。封顶块处弯矩较小,其弯矩由临近环衬砌结构承担;受环间接头错缝效应影响,幅宽边缘靠近衬砌结构纵缝处
3、轴力发生突变。关键词:盾构隧道;水下隧道;大断面;现场测试;壳-弹簧模型中图分类号:U283.4;TP391.9文献标志码:Adoi:10.3969/j.issn.1001-8360.2012.07.018FieldTestandNumericalSimulationofMechanicsofSegmentLiningofShiziyangUnderwaterShieldTunnel1,HEChuan1,XIAOMing-qing1,2,SONGHong-jiang3ZHOUJi-min(1.MOEKeyLa
4、boratoryofTransportationTunnelEngineering,SouthwestJiaotongUniversity,Chengdu610031,China;2.ChinaRailwaySiyuanSurveyandDesignGroupCo.,Ltd,Wuhan430063,China;3.Chengdu-kunmingRailwayCompany,ChengduRailwayAdministration,Chengdu610081,China)Abstract:TakingtheSh
5、iziyangUnderwaterShieldTunnelastheengineeringbackground,long-termfieldtrac-ingtestswerecarriedouttomeasuretheexternalloadandinternalforceofthesegmentliningstructureduringtheconstructionperiodofandafter-constructionstageandtoanalyzethechanginglawoftheexterna
6、lloadandinternalforcewithtime.The3Dshell-springfinitemodelwasestablishedtosimulatemechanicaldistributioncharacteristicsofthesegmentwithlargesectionandbroadwidth.Thestudyshowsthefollowingresults:Intheconstructionperiod,theliningiseasytoenterthebiasconditionw
7、ithsoilpressureandwithoutwaterpressureaftersegmentsleavetheshieldtrail;intheafter-constructionstage,withthetrendoflong-termgrowthofsoilandwaterpressure,theinternalforceincreasescorrespondinglyandtheincrementofaxialforceismoreobviousthanthatofthebendingmomen
8、t;the3Dshell-springmodelisapplicabletocalculationoftheliningstructureofsegmentwithlargesectionandbroadwidthanditscalculatedresultsareingoodaccordancewiththeexperi-mentalresults;thebendingmomentsarerela
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