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时间:2019-05-11
《动三轴试验中饱和软黏土的孔压特性及其对有效应力路径的影响_王军》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、第31卷第6期岩石力学与工程学报Vol.31No.62012年6月ChineseJournalofRockMechanicsandEngineeringJune,2012动三轴试验中饱和软黏土的孔压特性及其对有效应力路径的影响11,21,21王军,谷川,蔡袁强,杨芳(1.温州大学建筑与土木工程学院,浙江温州325035;2.浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310027)摘要:变围压动三轴试验能够同时施加循环变化的偏应力与循环变化的围压,可以模拟地震荷载下动剪应力与动正应力的耦合。通过GDS双向
2、动三轴设备进行一系列饱和软黏土的变围压动三轴试验,系统研究循环偏应力和循环围压耦合对饱和软黏土孔压特性的影响。试验结果表明:在单纯循环围压条件下,饱和软黏土会产生相应的正的瞬时动孔压,但是并没有产生明显的负的瞬时动孔压;在循环偏应力与循环围压耦合情况下,饱和软黏土的孔压时程曲线表现出与常规动三轴试验不同的特性,即动孔压的振幅更大,并且最大动孔压和最小动孔压表现出不同的发展规律:最大动孔压持续增长,而最小动孔压在加载一定周数后趋于稳定。此外,对残余孔压的定义进行量化,并对循环偏应力和循环围压耦合对有效应力路径的影
3、响进行研究。关键词:土力学;应力路径;孔压;动三轴试验;有效应力路径中图分类号:TU44文献标识码:A文章编号:1000–6915(2012)06–1290–07BEHAVIOROFPOREWATERPRESSUREINDYNAMICTRIAXIALTESTSOFSATURATEDSOFTCLAYANDITSEFFECTONEFFECTIVESTRESSPATH11,21,21WANGJun,GUChuan,CAIYuanqiang,YANGFang(1.CollegeofArchitectureandCivi
4、lEngineering,WenzhouUniversity,Wenzhou,Zhejiang325035,China;2.KeyLaboratoryofSoftSoilsandGeoenvironmentalEngineeringofMinistryofEducation,ZhejiangUniversity,Hangzhou,Zhejiang310027,China)Abstract:Thedynamictriaxialtestwithcyclicconfiningpressurecanapplycycli
5、cconfiningpressureinadditiontothecyclicdeviatoricstress,anditcansimulatethecouplingofcyclicshearstressandcyclicnormalstressinearthquakes.Theinfluenceofthecouplingofcyclicdeviatoricstressandcyclicconfiningpressureonthedevelopmentofporewaterpressureisstudiedus
6、inganadvancedglobaldigitalsystems(GDS)dynamictriaxialdevice.Testresultsshowthat:inpurecyclicconfiningpressuretests,thecyclicconfiningpressurecandevelopthecorrespondingpositiveporewaterpressure,butcannotdevelopthecorrespondingnegativeporewaterpressure;thecoup
7、lingofcyclicconfiningpressureandcyclicdeviatoricstressmakesgreatinfluenceonthebehaviorofporewaterpressures,theamplitudesofporewaterpressuresincreasegreatlyincomparisonwiththeconventionaldynamictriaxialtests;andthedevelopmentsofmaximumandminimumporewaterpress
8、ureshowdifferentbehaviors;andthemaximumdynamicporewaterpressurecontinuestogrow,whiletheminimumdynamicporewaterpressurestabilizesafteracertainnumberofweeksunderloading.Moreover,theresidualporewat
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