真空联合堆载预压法沉降计算与固结特性研究

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1、河海大学硕士学位论文真空联合堆载预压法沉降计算与固结特性研究姓名：辜清华申请学位级别：硕士专业：交通运输规划与管理指导教师：何良德20070401摘要本文分别阐述了真空预压、堆载预压和二者联合作用下的加固机理以及它们之间的异同点。根据试验段资料，借助比奥固结有限元基于线弹性模型，对三种预压方法的固结特性进行了研究；并将基于邓肯～张非线性弹性模型的数值解与实测值进行了比较。利用分层总和法结合改进的高木俊介法对地基沉降量进行动态估算，并对沉降修正系数进行了探讨。真空预压和真空联合堆载预压法在用分层总

2、和法估算最终沉降量时，不仅要考虑因沉降修正系数偏大带来的误差，而且还要考虑其采用的压缩系数是通过常规三轴压缩试验得出的结果，这一结果比等向压缩试验得出的压缩系数要大，从而导致计算出的主固结沉降量偏大带来的误差。最后对真空预压和堆载预压的最终沉降量的数值解进行了初步探讨，认为最终沉降量与渗透系数或泊松比有一定的关系。关键词：真空联合堆载预压；加固机理；固结特性；比奥固结理论；沉降修正系数；改进的高木俊介法AbstractThisdissertationanalyzesseparatelytheco

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4、el，hasbeenusedtoresearchtheconsolidationcharacteristicforthethreekindsofstrengtheningmethods．TheresultswhichhavebeencalculatedbyFEMbasedonDuncan-Changnon-linear-elasticmodel．arccomparedwiththesettlementresultsoffieldmonitor．Dyl枷cestimateofgroundsettl

5、ementandresearchforsettlementcorrectionfactorhavebeendonebyusinglayerwisesummationmethodcombined、^ritllthemodifiedGAOMUJUNJIEmethod．Wb朗evaluatingtheultimatesettlementforvacuumpreloadingandvacuunlcombinedwimsurchargepreloading,notonlyitshouldbeconside

6、redthatthecalculationultimatesettlementwhichismodifiedusingthesettlementcorrectionfactorincriterionislargerthanthepracticalsettlement，butalsoshouldbeconsideredthatthemainconsolidationsettlementwhichis，calculatedusingthecompressioncoefficientgottenfro

7、mtheconventionallriaxialcompressiontest，islargerthanthecalculationvalueusingthevaculHnstate’S．Intheend，thenumericalvaluesofultimatesettlementforVflEBumpreloadingandpreloadinghavebeendiscussedsimply．Itisconcludedthatthereareso．merelationshipsbetweenth

8、eultimatesettlementandpervasioncoefficientOrpoissonratio．Keywords：vacuul[1lcombinedwithsurchargepreloading；mechanismoffoundationstrengthening；consolidationcharacteristic；Biotconsolidationthcory；settlementcorrectionfactor,modifledGAOMUJUNJIEmethod学位论文