浅谈不对称超载作用下基坑内力与变形分析

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1、分类号：TU472密级：UDC：单位代码：10076工学硕士学位论文不对称超载作用下基坑内力与变形分析作者姓名：马志创指导教师：吴雄志教授申请学位级别：工学硕士学科专业：岩土工程所在单位：土木学院授予学位单位：河北工程大学万方数据ADissertationSubmittedtoHebeiUniversityofEngineeringFortheAcademicDegreeofMasterofEngineeringStudyonEndogenForceandDeformationofFoundationPitunderAsymmetricOverloadCandidate：MaZh

2、ichuangSupervisor：Prof.WuXiongzhiAcademicDegreeAppliedfor：MasterofEngineeringSpecialty：GeotechnicalEngineeringCollege/Department：CollegeofCivilEngineeringHebeiUniversityofEngineeringMay,2010万方数据摘要摘要在不对称超载作用下，基坑支护结构由于支撑间的相互作用，桩（墙）上所受的土压力以及支撑轴力发生变化，导致整个支护结构的内力、变形与对称超载作用时产生了较大差异。本文通过引用文克勒(Winkle

3、r)地基梁模型和共同变形理论的部分假设，采用相互独立的线性弹簧来模拟支护结构两侧的土体，假定松弛应力和挤压应力与桩（墙）位移成线性关系，建立了考虑基坑两侧相互影响的平面框架计算模型。文中以海南省海口市美兰机场隧道标准段里程DK17+190~DK17+290部分为研究对象，对整个施工过程包括基坑开挖、钢支撑施作和预应力施加等进行了杆系有限元分析，总结了不对称超载作用下支护结构内力和变形相对于对称超载作用下发生的一些变化，并简单讨论了基坑内力和变形的影响因素。通过基坑现场监测中桩体侧向变形及钢支撑轴力的监测数据，进而获得支护桩侧向变形和钢支撑轴力的时程曲线图，掌握基坑变形、支撑内力的

4、变化动态。同时总结了不对称超载作用下基坑施工中支护结构的内力与变形规律，并和数值模拟结果进行对比分析，探讨和总结了基坑支护结构变形的控制措施与方法。关键词：不对称超载；平面框架；杆系有限元；基坑监测I万方数据AbstractAbstractUndertheactionofasymmetricoverload,thesoilpressureonpiles(wall)andtheaxialforceofsupportstructurechangesduetotheinteractionofthefoundationpitsupportstructureleadingtheintern

5、alforce,deformationoftheoverallbuildingenvelopehaveobviouslychangeddifferentfromthesituationofsymmetryoverload.Thispaper,referencingthefoundationbeammodelofWinklerandsomeoftheassumptionsofco-deformationtheory,usingindependentofeachotherlinearspringtosimulatethesoilofbothsides,assumingthatrela

6、xationstressandcompressionstresshavealinearrelationshipwiththedisplacementofpiles(wall),establishestheplaneframecomputingmodel,andinthismodeltheimpactofexcavationonbothsidesofeachisconsidered.ThispaperresearchesthestandardmileagesectionDK17+190~DK17+290portionofMeilanAirportTunnelwhichisinHai

7、koucity,HainanProvince,usesfiniteelementtoanalysethedepartmentoftheentireconstructionprocessincludingexcavation,steelshotcretemaking,andapplyingprestress.Atthesametime,itsummarizesthedifferenceoftheinternalforce,deformationoftheoverallbuildin