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ID:35191938
大小:2.23 MB
页数:80页
时间:2019-03-21
《浅谈地震作用下坝基土体液化的判别及有限元分析》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、天津大学硕士学位论文地震作用下坝基土体液化的判别及有限元分析姓名:李敬梅申请学位级别:硕士专业:岩土工程指导教师:杨进良20040101摘要我国是一个多地震的国家,地震所造成的巨大破坏促使人们对现有建筑物的抗震性能进行准确评估和预测。为了对土体振动液化进行深入的研究,本文以实际工程为基础进行了液化判别。以试验为鏊础,利用标准黉入毒数试验、抗液化麓应力试验、翦韬波速试验的结果进行液化判别。并将三种方法的判别结果进行了对比分析,证明三种方法对液化的潮尉结莱基本~致。囝辩又对孔压的鬃袄情况_i{}行分褥,认为孔压达到上覆压力的80%时土体就发生液化,并将此作为本文有限元分析的液化判剐标准。本文
2、又在液化判别的基础上利用有效应力法的动力分析方法对坝基土体进行有隈元分耩。并将液佬静翔羯结暴与标准羹入击数法、蘩落渡速法、室内捩液化剪应力法的判别结果进行对比,证明了利用该有限元分析程序判别土体振动滚纯静实爱蠖帮可纛蛙。运建该{≥线性有羧元程序,对建震熬凄黪大小对波化的影响及对孔压的发生和发展的影响进行比较分卡斤,同时对坝基下卧粘土层麴±戆黯液化转彩旗遴行毙较分疆。关键词:动三轴试验标准赏入击数抗液化剪应力翦切波遮有限元分瓠等效线性模型有效应力法ABSTRACTTherearemanyearthquakesoccurringin0111"country,theaccurateevalua
3、tionandforecastoftheseismicbehaviorofexistingbuildingsarepromotedbytheenormousdestroymadebyearthquakes.Inordertoresearchdeeplythegroundliquefaction,theliquefactionevaluatingbasedonactualengineeringisperformedinthispaper.Basedonexperiment,liquefactioniSevaulatedthroughSPT、shearwavevelocitymethodan
4、dindoorcon—liquefactionshearstressmethod.Theresultsofthethreemethodsarecontrastedandprovedtobeconsistent.Byanalyzingthecumulmionofporewaterpressure,weconsiderliquefactionoccurswhentheporewaterpressuregetstO80percentofoverburdenpressure,andthisisconsideredtobetheevaluatingstandardofliquefactionbyf
5、initeelementanalysisinthispapeLOnthebasisofliquefactionevaluating.dynamicresponseofdarnfoundationiSanalyzedbyeffectivestressmethod,andtheresultofliquefactionevaluatingiscontrastedwiththeresultsofSPT、shearwavevelocitymethodandindoorcon—liquefactionshearstressmethod.Bycontrastingtheresults.thelique
6、factionevaluatingthroughfiniteelementanalysisprogrammeareprovedtobepracticableandreliableBythenon-linearfiniteelementprogramme,theerieCtofseismicintensitytoliquefactionandtooccurrenceanddevelopmentofporewaterpressurearecomparedandanalyzed,theeffectofS11bjacentbedtoliquefactionarecomparedandanalyz
7、edtoo.Keywords:cyclictriaxialtest,SPT,con—liquefactionshearstress,shearwavevelocityfiniteelementanalysis,equivalentlinearmodel,effectivestressmethod独创性声明本人声鹱搿整交魏学位谂文是本人在导簿瘤导下避行的蹬究互{乍彝驭褥浆磷究成聚,除了文中将剐奇西以标浚和致谢之楚外,论文中不包含冀谴入
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