真空—堆載聯(lián)合預(yù)壓加固軟基效果的試驗(yàn)研究.pdf

1、河海大學(xué)碩士學(xué)位論文真空—堆載聯(lián)合預(yù)壓加固軟基效果的試驗(yàn)研究姓名：吳桂芬申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：巖土工程指導(dǎo)教師：高玉峰尹敬澤20050301ABSTRACTVacuumpreloadingandvacuumcombinedmethodstoimprovethesoftfoundationThesewithsurchargepreloadingareeffectivetwomethodshavebeenusedwidelyinfreew

2、aydock，buildingandairport，etcButthetheoryofvacuumpreloadingdevelopsmoreslowlythanitsengineeringpracticeTherearemorequestionstosolve，suchastheeffectiveimprovementdepthbyvacuumpreloading，differencebetweenvacuumpreloadingan

3、dsurchargepreloading，themicroscopicstructureofthesoilaftervacuumpreloadingandvacuumcombinedwithsurchargepreloading，andSOonBasedonthesummaryoftheformers’studythemechanismofvacuumcombinedwithsurchargepreloadingisstudiedthr

4、oughlaboratorytest，fieldexperimentandmicrostmctureanalysisbytheauthorThemaincontentsofthispaperasfollowing：Firstlyvacuumpreloading，surchargepreloadingandvacuumcombinedwithsurchargepreloadingaresimulatedthroughlaboratoryt

5、estThemechanismandeffectbetweenthevacuumpreloadingandsurchargepreloadingofthesoilindifferentdepthareanalyzedThestrengtheningresultbetweenvacuumpreloadingandvacuumcombinedwithsurchargepreloadingunderthesamepreloadingisstu

6、diedSecondlysomeusefulconclusionsaredrawnthroughtheanalysesofthefieldexperimentdata，suchas，theeffectiveimprovementdepthundervacuumcombinedwithsurchargepreloadingis4metersdeeperthanthedepthofdrainpileinZhujiangThebasincur

7、veofsettlementhasrelationnotonlytotheconditionofboundary’SairproofbutalsototheconditionofsoilandthemagnitudeofpreloadingTheporewaterpressureindifferentdepthfalldownfastduringvacuum—pumpingbeforefillTheporewaterpressurein

8、creasesslowlyduringfillingbecauseofthevacuumnegativepressure，anditwilldecreasedeeplywhenthefillfinishesFinallythroughtheanalysesofthemicrostructurephotofromtheoriginalsoilsample，vacuumpreloadingsoilsample，surchargepreloa

9、dingsoilsampleandvacuumcombinedwithsurchargepreloadingsoilsample，someusefulconclusionsaredrawn：ThestrengtheningresultfromvacuumpreloadingandsurchargepreloadingCanbeaddedinmathematicsTheshapeofsoilgrainaftervacuumpreloadi

10、ng，surchargepreloadingandvacuumcombinedwithsurchargepreloadingbecomeslongandnarrowTheorderofthesoilgrainafterpreloadingboostupandtheorderoftheporespaceafterpreloadinggrowslowerThedistributingareainoneplaneofthesoilgraina

11、ftervacuumpreloading，surchargepreloadingandvacuumcombinedwithsurchargepreloadinggetslargerandthedistributingareainoneplaneoftheporespacebecomessmalleriethesoilsgrainsgetsmoredenseafterpreloadingKeywords：vacuumpreloading，