旋喷桩在既有线顶进箱涵中的应用

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1、密级：公开旋喷桩在既有线顶进箱涵中的应用研究ResearchonUsingCementInjectionPileinBoxCulvertJackinginExistingLines培养单位：土木工程分院专业：建筑与土木工程研究生：指导教师：二OO八年一月摘要在框架顶进中，由于不良地基的影响，需要对路基进行加固。特别是繁忙和提速后的线路要求顶进施工时限速不低于60km/h,对路基加固提出更高要求。高压旋喷桩由于其自身的诸多优点，广泛应用于修建框架桥时加固路基。本文结合萧山金城路东伸下穿铁路立交桥工程，分析了工程地

2、质资料，对工程施工的特点、难点以及工程的总体布置情况进行了扼要说明，同时对施工过程中的基础加臥基坑围护进行了详细的论述，重点介绍了高压旋喷桩的施工工艺，也对地道桥箱休顶进施工的总体安排及详细施工过程作了简要的阐述。对50组高压旋喷桩进行了试验，无侧限强度做7、14、28天三种龄期试验，抗剪强度做28天龄期试验，给出了钻芯检测成果表。利用ANSYS有限元软件对旋喷桩加固地基后顶进箱涵的力学特性进行分析。地道桥空间模型和平面模型分别计算得到的横向弯矩基本相同，考虑横向主筋配置时，仅采取平面模型计算就可以得到较好的结

3、果。纵向弯矩与横向弯矩的比值，无论是双孔还是单孔，随着地道桥长度的增加，横向弯矩占纵向弯矩比值逐渐增大。关键词：旋喷桩；顶进施工；地基加固；有限元AbstractBecausetheinfluenceofbadgroundneedbereinforcedtheroadbed,itisnecessarytoreinforcethegroundbaseinframejacking.Thespeedlimitwasnotlessthan60km/hwhenespeciallybusycircuitwiththebac

4、kofraisingspeedrequiredthetoptoadvancetoconstruct,proposedrequirementsatthehigherleveltoformationstrengthening・Thehighpressurecementinjectionpilesusereinforcementroadbedwhenbuildingtheframebridgeisextensivelyappliedtoitsselfagreatdealofmerit.Thispapercombine

5、sXiaoshanJinChengwayeastandwearsrailwayoverpassengineeringunderstretching,hasanalysedtheengineeringgeologymaterial,hascarriedoutbriefexplanationtothegeneralarrangementcircumstancesofcharacteristics,difficultpointandtheengineeringofconstmction,goalongwiththes

6、trengtheningoffoundationintheconstructioncourse,foundationditchbesidesandcarriedoutdetailedargumentation,hasintroducedtheconstructiontechnologythatthehighpressurecementinjectionpilessoonwithanemphasis,andalsoarrangethegenuinebridgeboxtoptotalitythatadvancest

7、heconstructionandconciseandtothepointexpositionhasbeendonetodetailedconstructioncourse.The50group'shighpressurecementinjectionpilesaretested,itisexperimentalthat7,14,28daysthreekindsoflengthoftimesaredonetonolateralconfinementintensity,anditisexperimentaltha

8、tthe28dayslengthoftimeisdonetotheshearingstrength,hasprovideddrillcoremeasuringachievementtable.TheANSYSfiniteelementsoftwareisusedtoanalysethemechanicalcharacteristicofBoxCulvertJackingafterthe