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时间:2019-05-22
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1、第27卷第2期岩石力学与工程学报Vol.27No.22008年2月ChineseJournalofRockMechanicsandEngineeringFeb.,2008原状Q2黄土三轴剪切特性11112方祥位,陈正汉,申春妮,王和文,刘厚健(1.后勤工程学院建筑工程系,重庆400041;2.西北电力设计院,西安陕西710032)摘要:探讨陕西蒲城电厂原状Q2黄土的变形、强度和屈服特性,并研究吸力对非饱和原状Q2黄土性质的影响。共进行2种12个原状Q2黄土试样的三轴剪切试验,即控制吸力和净围压为常数的非饱和土三轴排水剪切试验与控制初始含水量和
2、围压为常数的三轴剪切试验。研究结果表明,非饱和原状Q2黄土控制吸力为100,300,450kPa的试验试样呈塑性破坏,而控制初始含水量为4.78%和7.64%的试验试样则呈脆性破坏。原状Q2黄土随着吸力降低(或含水量增大)和固结围压的增大,应力–应变曲线由软化型逐渐向理想塑性及硬化型发展。在试验给出的吸力范围(100~450kPa)内,非饱和原状Q2黄土的黏聚力随吸力线性增加,而内摩擦角随吸力的变化很小,基本上可以认为是一常数。建议一种确定原状Q2黄土三轴剪切条件下屈服应力的方法,得到的屈服净平均应力和屈服偏应力随吸力增大而增大;同一吸力或含
3、水量下屈服偏应力和屈服净平均应力则呈线性关系。关键词:土力学;Q2黄土;三轴剪切;吸力;强度;屈服中图分类号:TU41文献标识码:A文章编号:1000–6915(2008)02–383–07TRIAXIALSHEARPROPERTIESOFUNDISTURBEDLOESSQ211112FANGXiangwei,CHENZhenghan,SHENChunni,WANGHewen,LIUHoujian(1.DepartmentofArchitecturalEngineering,LogisticalEngineeringUniversityofP
4、LA,Chongqing400041,China;2.NorthwestElectricPowerDesignInstitute,Xi′an,Shaanxi710032,China)Abstract:Aseriesoftriaxialsheartestswithcontrolledsuctionandnetconstantconfiningpressureandthetestswithcontrolledwatercontentandconstantconfiningpressurewereconductedtostudytheeffects
5、ofdeformation,strengthandyieldpropertiesofunsaturatedundisturbedloessQ2withsuctionsorinitialwatercontents.ThetestresultsshowthatthefailuremodelofunsaturatedundisturbedloessQ2withcontrolledsuctionsequaling100,300and450kPaisshownwithplasticfailure;butthefailuremodelofunsatura
6、tedundisturbedloessQ2withcontrolledinitialwatercontentsequaling4.78%and7.64%,respectively,isdisplayedwithbrittlefailure.Thestress-straincurvesofundisturbedloessQ2willchangefromstrainsofteningtostrainhardeningwiththedecreaseofsuction(ortheincreaseofwatercontent)andtheincreas
7、eofconsolidationcellpressure.ThecohesionofunsaturatedundisturbedloessQ2hasalinearincreasewiththeincreaseofsuctionwithinresearchsuctionrange(100–450kPa),butthefrictionangleisfoundtohavelittlechangewiththechangeofsuction.AnewmethodtoidentifythefieldstressofundisturbedloessQ2u
8、ndertriaxialshearconditionissuggested.Thenetmeanyieldstressanddeviatoricyieldstres
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