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1、含杂质盐岩三轴蠕变特性试验研究吴池1，刘建锋1*，周志威2，徐慧宁1，吴斐3，卓越4，王璐1（1.四川大学水力学与山区河流开发保护国家重点实验室水利水电学院,四川成都610065;2.四川凉山水洛河电力开发有限公司,四川成都610000;3.重庆大学资源及环境科学学院,重庆400030;4.四川省水利水电勘测设计研究院,四川成都610072）摘要：针对杂质盐岩蠕变力学特性问题，利用四川大学大型程控流变仪，对两种不同杂质盐岩进行了分级加载下的三轴蠕变试验。试验结果表明：围压和杂质含量不同，盐岩破坏形
2、态以及力学参数均有差异。围压小于临界围压，盐岩呈剪切破坏，围压大于临界围压，盐岩呈大变形鼓状破坏；围压和杂质含量一定，岩盐稳态速率随偏应力增加呈指数增长；偏应力和杂质含量一定，蠕变速率随围压增大而降低，长期强度有所增大；偏应力和围压一定，低杂质(ω=2.1%)盐岩稳态蠕变速率高于高杂质(ω=46.8%)盐岩。体积变形经历了压密期-平静期-扩容期三个阶段，高杂质盐岩体积应变低于低杂质盐岩。将不溶物杂质含量与应力敏感性常数n的关系同分数阶蠕变本构方程进行耦合，建立了耦合杂质的盐岩分数阶非定常蠕变模型，
3、将理论模型与试验数据对比分析证实了该模型的合理性。关键词：三轴；蠕变；杂质；盐岩；体积变形；分数阶本构模型StudyoncreeppropertiesofsaltrockwithimpuritiesduringtriaxialcreeptestWUChi1,LIUJianfeng1*,ZHOUZhiwei2,XUHuining1,WUFei3,ZHUOYue4,WANGLu1(StatekeyLabofHydraulicandMountainRiverEngineer,CollegeofWater
4、ResourceandHydropower,SichuanUniversity.,Chengdu610065,China;SichuanLiangshanShuiluoheElectricPowerDevelopmentCo.Ltd.,Chengdu610000,China;CollegeofResourceandEnvironmentalScience,ChongqingUniversity,Chongqing400030,China;SichuanInstituteofWaterResourc
5、esandHydroelectricExplorationDesignandResearch,Chengdu610072,China)Abstract:Inordertostudycreepcharacteristicsofsaltrockwithimpurities,thetriaxialloadingtestsabouttwosaltrockwithdifferentimpuritycontentwerecarriedoutonlarge-scaleprogrammablerheometero
6、fSichuanuniversity,Theresultsshowedthatthefailurepatternandmechanicalparametersofsaltrockaredifferentasthechangeofconfiningpressureorcontentofimpurities,Thedestructionalformofsaltrockchangefromsheartodrumtypewhentheconfiningpressureincrease.Thesteady-
7、statecreeprateofeachsamplegrowsexponentiallywiththedeviatoricstresswhenconfiningpressureandimpuritycontentisthesame.Asincreaseofconfiningpressure,thecreeprateisdepressed,butthelong-termstrengthisincreasedwhendeviatoricstressandimpuritycontentisthesame
8、.Thesteady-statecreeprateoflow-impurity(ω=2.1%)ishigherthanhigh-impurity(ω=46.8%)whendeviatoricstressandconfiningpressureisthesame.Volumestrainexperiencedthreeperiod:pressuredense-quiet-dilatation,thevolumestrainofsaltrockwithhighimpuritiesinf
