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1、DecompressionofthethreeaxialcompressiontestofthemechanicalcharacteristicsoffissuredloessADissertationSubmittedfortheDegreeofMasterCandidate：LeChongHaoSupervisor：Prof.LuQuanzhongChang’anUniversity,Xi’an,China摘要本文通过野外调查、室内试验、理论分析的方法，对裂隙性黄土进行研究。对裂隙性黄土较为发育的地方（黄
2、土裂隙）的基本特征进行了描述。基于减压三轴压缩试验对裂隙性黄土的力学特性、变形破坏机理、本构模型进行了系统的研究。本文的主要内容为：（1）裂隙性黄土的基本特征，对黄土裂隙进行分类，并从黄土的结构面和黄土体结构方面描述了裂隙性黄土的工程地质特征。（2）介绍了减压三轴压缩试验的试验方案和试验步骤。对裂隙性黄土在减压三轴压缩试验中得到结果从应力应变关系曲线入手进行了分析得到裂隙性黄土随着轴向压力的增大，其应力应变关系曲线的软化现象越发明显，土样的峰值强度和弹性模量也都随着轴向压力的增大而增大。并且总结了裂隙性黄土的
3、整体变形方式、破坏类型和破坏方式，概化了裂隙性黄土的变形破坏力学模式和材料类型。（3）引用岩土破损理论，根据桑德勒尔的加载函数推导了一般二元介质的本构模型。建立减压三轴压缩条件下的本构模型，选取几组试样对该本构模型进行验证，其结果表明，该本构模型具有一定的适用性。关键词：裂隙性黄土，变形破坏机理，本构模型IAbstractThisarticlemakesastudyonfissuredloessthroughfieldinvestigation,indoortestandtheoreticalanalysis
4、method,anddescribesbasicfeaturesofloessfracturewhichisthepartofabundantfissuredloess.Basedonthereducedpressuretri-axialcompressiontest,asystematicstudyisconductedonthemechanicalcharacteristicsofloess,deformationandfailuremechanismandconstitutivemodelforthes
5、ystem.Thecontentofthispaperisasfollowing:Firstly,thispaperdescribesthebasiccharacteristicsoffissureloess,classificationoffissureloess,andtheengineeringgeologicalcharacteristicsoffissureloessattheaspectofthestructuralplaneoftheloessfaceandstructureofloess.Se
6、condly,thispaperalsointroducestheschemesandtestproceduresofthereducedpressuretri-axialcompressiontest.Bymakingananalysisofthistestintermsofstraincurve,itisfoundthatthemoreaxialcompressiveforceoffissureloessisincreased,themoreobviousruckbildungofstraincurvei
7、s,andthatpeakintensityaswellaselasticmodulusofsoilsamplesalsoincreaseswiththeincreaseofaxialcompressiveforce.Inaddition,thispaperalsosummarizesthewaysofgeneraldeformationoffissureloess,itsdamagetypesanditsdestructionways,andthisstudygeneralizesthedeformatio
8、ndamagemechanicsmodelandmaterialtype.Thirdly,adoptinggeotechnicaldamagetheory,generalbinarymediumisdeducedbasedonloadingfunctionfromThorntonReul.Andtheconstitutivemodelisestablishedundertheconditionoft
