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1、第34卷第6期公路交通科技Vol．34No．62017年6月JournalofHighwayandTransportationResearchandDevelopmentJun．2017doi:10．3969/j．issn．1002-0268．2017．06．014浅覆土特长箱涵顶进结构受力特性数值分析122郭瑞,王枫,洪刚(1．陕西理工大学土木工程与建筑学院,陕西汉中723001;2．云南建投第四建设有限公司,云南昆明650023)摘要:为了探明顶进施工中浅覆土特长箱涵顶进结构的受力特性,结合
2、广东地区某工程实例,通过三维有限元模拟分析了不同顶进长度、覆土厚度及摩阻系数等工况条件下浅覆土特长箱涵顶进结构的应力应变变化规律及顶进施工扰动影响范围,结果表明:相同工况条件下,随着顶进长度增加浅覆土特长箱涵顶板和底板的应力与应变呈现靠椅状变化趋势,而其腹板的应力与应变则呈现倒梯形截面变化趋势;涵顶覆土厚度及其性状对浅覆土特长箱涵顶进结构的应力与应变影响较大,涵顶覆土厚度越厚土体越密实,箱涵结构所受应力与应变越大;受顶进施工影响,涵顶上覆路面的沉降量为7．0~17．1mm,沿顶进方向路基路面受扰
3、动影响范围为23~30m,与采用泥浆减阻措施相比采用石蜡+机油措施的减阻效果更为有效。关键词:桥梁工程;浅覆土特长箱涵;数值模拟;受力特性;顶进施工中图分类号:U449．82文献标识码:A文章编号:1002-0268(2017)06-0094-05NumericalAnalysisonMechanicalCharacteristicsofJackingDeviceforShallowSoil-coveredandOver-longBoxCulvert122GUORui,WANGFeng,HONG
4、Gang(1．SchoolofCivilEngineeringandArchitecture,ShaanxiSci-TechUniversity,HanzhongShaanxi723001,China;2．YunnanConstructionInvestmentFourthConstructionCo．,Ltd．,KunmingYunnan650023,China)Abstract:Inordertofindoutthemechanicalbehaviorofshallowsoil-covere
5、dandover-longboxculvertinthejackingconstructionprocess,combiningwithaprojectexampleinGuangdongareaandbasedon3Dfiniteelementsimulation,thechangelawofstressandstrainofthejackingdeviceandthejackingdisturbanceinfluenceareaarestudiedundertheconditionsofdi
6、fferentlengths,coveringthicknessesandfrictioncoefficientsarestudied．Theresultshowsthat(1)underthesameworkingcondition,withtheincreaseofthejackinglength,thestressandstrainofthetopandthebottomplatesoftheboxculvertshowthe“arm-chair”changeshape,whilethes
7、tressandstrainofthewebshowthetrendof“trapezoidalcross-section”;(2)thethicknessandthecharacterofthecoversoilatthetopplateoftheboxculverthavegreatinfluenceonthestressandstrainoftheboxculvertstructure,thethickerandthemoredensethecoveredsoil,thegreaterth
8、estressandstrainoftheboxculvertstructure;(3)bytheaffectfromboxculvertjackingconstruction,thepavementsettlementatthetopoftheboxculvertisintherangeof7．0-17．1mm,andthescopeofthedisturbedroadbedandroadsurfacealongthejackingdirectionis23-30m;(4)thedragred
