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时间:2019-05-26
《管幕内顶进箱涵顶部管幕承载作用的分析》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24卷第18期岩石力学与工程学报Vol.24No.182005年9月ChineseJournalofRockMechanicsandEngineeringSept.,2005管幕内顶进箱涵顶部管幕承载作用的分析111123肖世国,朱合华,夏才初,李向阳,沈桂平,葛金科(1.同济大学地下建筑与工程系,上海200092;2.上海市中环线建设发展有限公司,上海200072;3.上海市第二市政工程有限公司,上海200063)摘要:上海市中环线虹许路北虹路下立交工程是目前世界上在饱和含水软土地层中施工的横截面最大的管幕法工程。根据地面沉降限制
2、要求,并按照以较缓慢速度顶进箱涵且开挖土体过程中前方土体滑动的极端不利情况分析了顶部钢管幕的承载作用,针对钢管不同部分的受力状况不同,主要按两端固定梁以及弹性地基梁2种模型分情况对钢管的不同部分进行计算分析,并对该工程的情况进行了具体的计算。结果发现在箱涵顶进过程中,管幕起到相当大的力学作用,上覆土体的重量有一定量被顶部管幕承担而不向其下面传递,有助于提供箱涵前端网格尺寸经济而合理的设计。关键词:土力学;管幕;箱涵;土压力;弹性地基梁中图分类号:TU43文献标识码:A文章编号:1000–6915(2005)18–3355–05SUPP
3、ORTEFFECTANALYSISOFUPPERPIPE-ROOFDURINGABOXCULVERTBEINGPUSHEDWITHINPIPE-ROOF111123XIAOShi-guo,ZHUHe-hua,XIACai-chu,LIXiang-yang,SHENGui-ping,GEJin-ke(1.DepartmentofGeotechnicalEngineering,TongjiUniversity,Shanghai200092,China;2.TheMiddleRingRoadConstructionandDevelopmen
4、tCo.Ltd.,Shanghai200072,China;3.TheSecondMunicipalConstructionCo.Ltd.,Shanghai,Shanghai200063,China)Abstract:Uptonow,thesubwaycrossingprojectthroughHongxuRoadisapipe-roofprojectwithlargestcross-sectionboxculvertintheworld.ItisconstructedinsaturatedsoftsoilstratumintheBe
5、ihongRoadlocatedinthemiddlering-roadinShanghai.Basedonrestrictionsofgroundsettlementandextremelydangerouspotentialslidingconditiononsoilinfrontoftheboxculvertduringtheculvertbeingpushedslowlyandsomesoilbeingexcavated,supporteffectofupperpipe-proofisanalyzedinorderthatme
6、chanicalcharacteristicsofthepipe-roofcanbecompletelyknown.Becausedifferentsegmentsofthesepipeshavedifferentmechanicalstatus,theyareanalyzedmainlybysupportedbeammodelwithtwofixedendsandbeamonelasticfoundationmodel.Supporteffectoftheupperandmiddlepipeisanalyzedindetailint
7、hepracticalproject.Theresultsshowthatthepipe-roofplaysanimportantmechanicalroleinthecourseoftheculvertbeingpushed.Itcansupportquitealittleweightofsoilonitsothatonlypartialweightwilltransfertothestratumunderit.Sothepipe-roofcanbebenefitforeconomicandrationaldesignofsteel
8、gridsinvertedinthefrontoftheculvertforstabilizingthecuttingsurface.Keywords:soilmechanics;pipe-roof;boxculvert
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