凍土中樁基水平動(dòng)力響應(yīng)特征研究.pdf

1、北京交通大學(xué)碩士學(xué)位論文凍土中樁基水平動(dòng)力響應(yīng)特征研究姓名：王軍申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：地下工程指導(dǎo)教師：張鴻儒20090601ABSTRACTABSTRACT：Withthedevelopmentofthewesternregionandtheimplementationofthestrategytorevitalizethenortheast，moreandmoreconstructionswerebuiltinpermafrost

2、regions。PilefoundationsalethemainformconstructionfoundationinpermafrostregionThepilefoundationsaresupposedtobearboththestaticloadanddynamicloadHoweverthedynamicbehaviorespeciallyhorizontaldynamicbehaviorofpilefoundations

3、isresearchedrarelyinpermafrostregionBasedonlowtemperaturedynamictriaxialtest，thisarticleestablishedthreedimensionaldynamicinteractionanalysismodelofpilefrozensoilbyFinitedifferenceprocedures，andthedynamicresponseofthesin

4、glepileandpilegroupsinthelevelofharmonicloadsWaSexaminedThemainconclusionSareasfollows：(1)Itisacomplexprocessofchangethatpilefoundationbeardynamicload，inwhichthedynamicresponseofpiledecreasedalongthedepth；Pilesoilstiffne

5、ssratioistheimportantfactorswhichimpactthepilelateraldynamicperformance；Accordingtothecalculationsinthisarticle，thenatureofsoilintherangeofdepthwhichis10timesthepilediameterAstheelasticmodulusofsoilincreased，theDisplacem

6、entofthepiledecreased；(2)HorizontaldisplacementofpilegroupsismainlyaffectedbytheimpactofpilespacingWiththeincreaseofthepilespacing，thehorizontaldisplacementofpilebecomesmallInsomeCaseS，horizontaldisplacementofpilegroupsi

7、slessthanthehorizontaldisplacementofsinglewhichbearsaverageloadItisassociatedwiththepilespacingandthefrequencyoftheload(3)Insomecases，dynamicstiffnessofpilegroupsmaybelargerthanthedynamicstiffnessofsinglepileItisassociat

8、edwiththepilespacingandthefrequencyoftheloadIIlthelowfrequencyphase，dynamicstiffnessofpilegroupsislessthanthedynamicstiffnessofsinglepilewhichbearsaverageloadWiththeincreasenumberofpilesincreases，dynamicstiffnessofpilegr