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ID:28193808
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页数:3页
时间:2018-12-08
《可液化土层的位置对土层地下结构地震反应的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、可液化土层的位置对土层地下结构地震反应的影响摘要:令榱搜芯坎煌令位置的液化土层对地下结构地震反应的影响,采用PL-Fin土体液化本构模型,使用FLAC3D进行了研宄,总结了液化土层发生液化大变形时刻液化区分布、孔隙水压力与超静孔隙水压力比变化规律及差异、地下结构的位移及差异沉降规律,并与非液化场地下的地下结构地震反应进行了对比.主要结论有:当结构底部存在液化土层时,引起的结构位移最大,使结构下沉;结构两侧的土体液化会引起结构上浮,并使侧墙水平向向层间位移和顶底板竖向层间位移增加;结构整体位于液化土层中时,土体位移、结构位移和结构层间位移差都不是
2、最大值,仅研究结构整体位于液化土层的规律存在不足;结构周围、两侧、底部、底部45°位置、左右两侧和底部45°位置以及底部和底部45°位置存在液化土层位置共计6种工况下结构顶板y向层间位移变化规律基本一致,但车站不同位置存在液化土层,土层液化的反应和对结构的影响存在一定差异;液化大变形发生在孔隙水压力和超孔压比突增后的1〜3s后,因此可由孔隙水压力和超孔压比的突变判断是否发生液化大变形.关键词:液化;地下结构;PL-Fin模型;地震反应中图分类号:TU93文献标志码:A文章编号:1674-297405-0143-14Abstract:Inorde
3、rtostudytheseismicresponseofundergroundstructureswhenliquefiedsoillayerislocatedindifferentpositions,thePL-FinconstitutivemodelproposedanddevelopedinFLAC3Dwasusedinthispaper.Thetimewhenlargedeformationoccurred,liquefiedareadistribution,thelawanddifferenceofporewaterpressurea
4、ndexcessporewaterpressureratio,thelawofthedisplacementcharacteristics,anddifferentialsettlementofstructureweresummarized.Theirdifferenceswerealsocomparedandanalyzedwhenthestructureisonnon-liquefiedsoillayer.Theprimaryconclusionsareasfollows:thedisplacementofstructurewasthela
5、rgestwhenliquefiedsoillayerwasunderstructureandcausedthestructuresink;theliquefiedsoilonbothsidesofthestructurecausedthestructurefloatupward,andincreasedthedisplacementbetweenthelayersofsidewallsinthehorizontaldirectionaswellasbetweentheroofsandfloorsintheverticaldirection;t
6、hesoildisplacementandthedisplacementanddifferentialsettlementofstructurewereallnotthelargestwhenstructurewasalllocatedovertheliquefiedsoil,soitwasnotenoughtoonlystudythelawwhenstructurewasembeddedinliquefiedsoil;thelawofthey-displacementofstorydriftontopplatewassimilarwhenth
7、eliquefiedsoilwaslocatedatsixdifferentpositionsincludingaroundthestructure,onitstwosides,initsbottom,in45degreesatthebottomofthelocation,onitstwosidesand45degreesatthebottomofthelocation,andinitsbottomand45degreesatthebottomofthelocation,buttheresponseofliquefiedsoilandthein
8、fluenceonthestructureperformanceweredifferent;andthelargedeformationcausedb
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