真空联合堆载预压加固软基试验及理论研究

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1、浙江大学博士学位论文真空联合堆载预压加固软基试验及理论研究姓名：金小荣申请学位级别：博士专业：岩土工程指导教师：龚晓南;俞建霖20070101浙江大学博士学位论文AbstractVacuumpreloadingandvacuum-surchargepreloadingareeffectivemethodstoimprovesoftfoundation．Inrecentyears，thesemethodwasextensivelyusedtotreatsoftclaygroundsuchasharbo

2、ryard,airport,electricpowerplant,expresshighway,highwayatbridge-headandetc．Therehavebeengreatdeepdevelopmentsofimprovementmechanism，constructiontechniquesanddesigntheory,whereasthedevelopmentoftheoryforvacuumpreloadingandvacuum-surchargepreloadinghasla

3、ggedbehindalottheengineeringpractice．ManyproblemssuchasthedifferencebetweenVacuumpreloadingandsurchargepreloading，thefeasibilityofsoftclay谢thconfinedwaterbyvacuumpreloading．theruleofundergroundwaterduringvacuumpreloading，thestabibilityofvacuum—surcharg

4、epreloading,theenvironmenteffectofvacuumpreloading．itscontrolmethodandctcstillexist．Thisstatushaslimitedthemoreandmoreapplicationanddevelopmentofthesetwomethods，whichlargelyprovokesmorebothacademicandengineeringresearchersathomeandabroad．Basedontheform

5、erresearchers’achievement．thisdissertationfocusedonthemechanismandtheoryofvacuumpreloadingandvacuum-surchargepreloadingthroughlaboratorytest．fieldexperimentandtheoreticalstudy．nemainaspectsofthisdissertationwerestudiedasfollows：1．BasedontheimprovedRowe

6、’Sconsolidationapparatus，thelaboratorytestsofvacuumpreloading,surchargepreloadingandvacuum-surchargepreloadingwereconduced．2．Fieldexperimentofsoftground诵tllconfinedwateratGangwan220kVWasperformed．n圮resultsshowedthatit'ssafeandeconomicthatthetechnologyo

7、f'tearingmembrane'wascombinedwimthe'non-tearingmembrane’whiledrivingPVDs．n忙mainsettlementscouldbeeliminatedeffectivelybyvacuum-surchargepreloadingatsoftfoundationwitllconfinedwater,thedegreeofconsolidationoftotalsoftsoilwas83％andthatpredictionpost-cons

8、tructionwhichwouldlastformorethan100yearswasacceptable．3．Accordingtotheprincipleofequalityofdegreeofconsolidation,basedonthenegativepressuredistributionpatternoftwiceexponentialdecay,theformulaofequalityforsanddrainswasdeduced．Thesoluti