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1、第34卷第5期公路交通科技Vol．34No．52017年5月JournalofHighwayandTransportationResearchandDevelopmentMay2017doi:10．3969/j．issn．1002-0268．2017．05．009基于Weibull分布的土-结构接触面剪切损伤模型研究龙尧,张家生,陈俊桦(中南大学土木工程学院,湖南长沙410075)摘要:针对土-结构接触面剪切特性,基于现有统计损伤理论提出了土-结构接触面剪切损伤模型及模型参数的确定方法。利用大型直剪仪对红黏土-混凝土结构接触面进行直剪试验,
2、分析了红黏土-结构接触面上剪应力-应变特性。根据试验结果得到红黏土-结构接触面剪切损伤模型的相关参数,建立了基于Weibull分布的损伤模型参数与法向应力的关系,并对模型进行了修正。最后将理论计算结果与试验结果进行了对比分析,验证了该模型的合理性。研究成果表明:法向应力水平越大,黏性土-结构接触面剪切软化现象越不显著,应力应变关系由软化型转变为弱软化型。通过对接触面直剪试验的成果进行验证,模型计算与试验结果吻合较好,证明了文中提出的剪切损伤模型具有能够充分反映土-结构接触面软化特性和应力状态的特点,模型参数较少。关键词:道路工程;损伤模型;
3、Weibull分布;接触面;损伤因子中图分类号:U416．2文献标识码:A文章编号:1002-0268(2017)05-0065-07StudyonShearDamageModelforSoil-structureInterfaceBasedonWeibullDistributionLONGYao,ZHANGJia-sheng,CHENJun-hua(SchoolofCivilEngineering,CentralSouthUniversity,ChangshaHunan410075,China)Abstract:Basedonthesta
4、tisticaldamagetheoryandtheshearcharacteristicsofsoil-structureinterface,asheardamagemodelofsoil-structureinterfaceandthemethodfordeterminingitsparametersarepresented．Thedirectsheartestontheinterfacebetweenredclayandconcreteblockiscarriedoutbyusinglargedirectshearapparatus,
5、andthecharacteristicsofshearstress-strainoftheinterfaceareanalyzed．Therelativeparametersofthesheardamagemodelarealsoobtainedfromtheresultofthetestresult．TherelationshipsbetweenthemodelparametersandnormalstressesareconstructedbasedonWeibulldistribution,andthemodifiedshearda
6、magemodelisdeveloped．Atlast,thecomparisonbetweentheexperimentalandthetheoreticalcurvesismade,whichverifiedtherationalityofthemodel．Theresearchresultshowsthatthelargerthenormalstress,theweakertheshearsofteningoftheinterface．Therelationshipbetweenstressandstrainisturningfrom
7、softeningstatetoweaksofteningstate．Thesheardamagemodelisverifiedwiththeresultofdirectsheartest,andthepredictedresultofthemodelisagreeablewithtestdata．Thesheardamagemodelcanfullyreflectthesofteningcharacteristicsandthestressstatesofthesoil-structureinterface,andafewofparame
8、tersareincludedinthesheardamagemodel．Keywords:roadengineering;damagemodel;Weibulldistribu
