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大小:2.62 MB
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时间:2020-03-23
《剪切速率对结构性吹填软土力学特性影响试验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofEngineeringGeology工程地质学报1004-9665/2015/23(1)000706DOI:10.13544/j.cnki.jeg.2015.01.002剪切速率对结构性吹填软土力学特性影响试验研究①②①②杨爱武雷博(①天津城建大学土木工程学院天津300384)(②天津市软土特性与工程环境重点实验室天津300384)摘要黏土在剪切变形过程中,剪切速率的不同会对其结构破坏产生不同影响,从而影响其力学特性。本文以天津滨海新区吹填软土为研究对象,在对吹填软土关于结构性讨论的基础上,开展了剪切速率对其力学性状影响的三轴试验研究,分析其剪切速率力学效应。试验结果表
2、明:随着剪切速率的提高,在低围压条件下,吹填软土的强度及其结构屈服应力均先减小后增大,存在临界剪切速率,而在高围压条件下,强度及其结构屈服应力则逐渐增大,与剪切速率呈正相关关系,临界剪切速率逐渐消失;吹填软土的黏聚力在不同围压下随剪切速率提高均呈现减小趋势,内摩擦角在低围压条件下随剪切速率提高呈现增大趋势,在高围压条件下则随剪切速率提高呈现减小趋势;在剪切过程中,孔隙水压力均随着轴向应变的增大到某一值然后稳定下来,随着围压的进一步加大,孔隙水压力的稳定值会随剪切速率的提高呈减小趋势。关键词吹填软土结构性剪切速率力学特性结构屈服应力中图分类号:TU41文献标识码:AEXPERIMENTALSTU
3、DYONEFFECTOFSHEARINGRATEONMECHANICALBEHAVIOROFSTRUCTUREDSOFTDREDGERFILL①②①②YANGAiwuLEIBo(①SchoolofCivilEngineering,TianjinChengjianUniversity,Tianjin300384)(②KeyLaboratoryofTianjinSoftSoilCharacterandEngineeringEnvironment,Tianjin300384)AbstractInclaysheardeformationprocess,differentshearrateshavedi
4、fferenteffectsonitsstructuraldamage,thusaffectingitsmechanicalbehavior.ThispapertakesthesoftdredgerfillfromTianjinBinhaiNewAreaasresearchobject.Itdiscussesthestructuralaboutsoftdredgerfill,andcarriesoutthetriaxialshearteststostudyeffectsonmechanicalbehaviorcausedbydifferentshearrates,analyzesitsmech
5、anicaleffectofshearingrate.Thetestresultindicatesthatastheshearrateincreases,atlowconfiningpressurecondition,thestrengthandstructuralyieldstressofsoftdredgerfillincreaseatfirstandthendecrease,existingacriticalshearrate.Athighconfiningpressurecondition,thestrengthandstructuralyieldstressincreasegradu
6、ally,whichshowsapositivecorrelationwiththeshearingrate.Thecriticalrateisdisappearinggradually.However,atdifferentconfiningpressureconditions,thecohesionofdredgerfilldecreasesastheshearingrateincreases.Astheshearingrateincreases,theinternalfrictionangleshowsanincreasingtrendatlowconfiningpressurecond
7、ition,whichshowsadecreasingtrendathighconfiningpressurecondition.Intheshearingprocess,porewaterpressureincreaseswiththeincreaseof收稿日期:2014-01-15;收到修改稿日期:2014-07-17.基金项目:国家自然科学基金(41372291)资助.第一作者简介:杨爱
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