深基抗雙排樁支護(hù)結(jié)構(gòu)工作性狀的研究.pdf

1、原剞性聲明本人聲明，所呈交的學(xué)位論文是本人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。盡我所知，除了論文中特別加以標(biāo)注和致謝的地方外，論文中不包含其他人已經(jīng)發(fā)表或撰寫過(guò)的研究成果，也不包含為獲得中南大學(xué)或其他單位的學(xué)位或證書而使用過(guò)的材料。與我共同工作的同志對(duì)本研究所作的貢獻(xiàn)均已在論文中作了明確的說(shuō)明。作者簽名：i曰期:年q月日關(guān)子等隹袼文使用梭權(quán)說(shuō)明本人了解中南大學(xué)有關(guān)保留、使用學(xué)位論文的規(guī)定，s卩：學(xué)校有權(quán)保留學(xué)位論文并根據(jù)國(guó)家或

2、湖南省有關(guān)部門規(guī)定送交學(xué)位論文，允許學(xué)位論文被查閱和借閱；學(xué)?？梢怨紝W(xué)位論文的全部或部分內(nèi)容，可以采用復(fù)印、縮印或其它手段保存學(xué)位論文。同時(shí)授權(quán)中國(guó)科學(xué)技術(shù)信息研究所將本學(xué)位論文收錄到《中國(guó)學(xué)位論文全文數(shù)據(jù)庫(kù)》，并通過(guò)網(wǎng)絡(luò)向社會(huì)公眾提供信息服務(wù)。作者簽名：5導(dǎo)師簽名：年丨■^月ol日中南人學(xué)碩十學(xué)位論文摘耍ABSTRACTWiththewidelyuseofdeepexcavationsinhighrisebuildingssubw

3、ayengineeringMunicipalEngineeringthesafetyissuesduetothedeeperdepthhavebecomesignificantlynoticeable.Waystoensurethesafetyinconstructionofdeepfoundationnearbystructuresarethekeypointstotheconstructionofhighrisebuildings.

4、Thedoublerowpilesasonetypeofthebracingprojectsofdeepfoundationpithavedrawngeneralattentionfromtheengineersowingtoitsuniqueadvantages.UnderthebackgroundoftheexcavationofQingdaoNthMetroStationProjectthepaperreviewstheresea

5、rchesoftheresearchachievementofexcavationsbothathomeandabroadaFLAC3Dnumericalcomputationmodelbasedonfinitedifferencemethodconsideringeithertheeticalnumericalanalysishasbeenpresentedinthispapertostudytheeffectsofstressdef

6、mationofthestructureofdoublerowpiles.Thefollowingmainconclusionscanbedrawnfromthestudy.1.Themainparametersthatinfluencethemechanicalpropertiesofbracingstructureofdoublerowpilesarethedepthdiameterofapilethespacingbetween

7、thepilestworowstopbeamstiffnessgroundimprovementintheactiveearthpressurezone.2.Remainingaconstantdepthofthebackrowpilethelateraldisplacementofthepiletopdecreaseswiththeincreasinglengthofthefrontrowpileuntiltheminimumval

8、ueisreachesatthelengthof16mafterthatitthenincreases.Furthermetheinternalfcesandthesurfacesettlementsbothachievetheminimumvalessimultaneouslywhendisplacementappearsaminimum.3.Keepingaconstantlengthoffrontrowpilesthedefma

9、tionofthepilebolckvarieswiththelengthofbackrowpilechangsfrom14mto24mbehavisasthepreviousonefthesamereasonalsoreachesaminvalueat16mtogetherwiththeinternalfcesthesurfacesubsidence.4.Keepingotherparametersconstantboththefr

10、ontthebackrowsofpileshavearelativelysmalldisplacementofthepilebolckspacingvariesfromlmto2mandthetopdisplacementsreachaminimumat16mtogetherwiththeinternalforceandthesurfacesubsidence.5.Comparingtheresultsofdifferentpiled

11、iametersvaryingfrom0.5mto2monthedefmationwithkeepingtheotherparametersunchangingboththerowsofpilesarefoundtoamindisplacementsatthetopasitis2mincludingtheinternalforceandsurfacesettlement.6.Thelateraldisplacementofthepil

12、ebolckinfrontbackrowsreachesaminvaluewhenthespacingbetweenthetworowsreaches4motherparametersstaythesame.Similarlytheinternalfcesthesurfacedeformatiofialsoreachaminorvalue.7.Thereinfcementofsoilinthepassivezoneisbenefici