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1、摇第35卷第10期煤摇摇炭摇摇学摇摇报Vol.35摇No.10摇摇2010年10月JOURNALOFCHINACOALSOCIETYOct.摇2010摇摇摇文章编号:0253-9993(2010)10-1604-05软岩屈服面流变本构模型及围岩稳定性分析1,2,31,2,33李栋伟,汪仁和,范菊红(1郾矿山地下工程教育部工程研究中心,安徽淮南摇232001;2郾矿山建筑安徽省高校重点实验室,安徽淮南摇232001;3郾安徽理工大学土木建筑学院,安徽淮南摇232001)摘摇要:用先高围压固结再卸载的三轴剪切蠕变试验方法模拟深部矿井软岩巷道开挖过程中应力状态随时间的变
2、化过程,通过大量的试验获得:在试验围压范围内软岩蠕变强度包络线可以用Mo鄄gi鄄Coulomb准则来描述;侧向卸荷条件下软岩具有十分明显的剪胀性,且体积应变占总应变的10%~20%。为了全面反映极软岩在卸载状态下的蠕变变形规律,提出了考虑体积变形的Mogi鄄Cou鄄lomb屈服面型流变本构力学模型。对淮南某深部矿井软岩三轴蠕变试验和巷道开挖支护过程进行了有限元数值模拟,结果表明:提出的蠕变本构模型能够较好地反映软岩的剪胀性和体积应变等蠕变变形规律,数值模拟结果和现场实测吻合良好。关键词:岩石力学;侧向卸载;软岩巷道;稳定性分析;Mogi鄄Coulomb屈服准则中图
3、分类号:TU457摇摇摇文献标志码:AYieldsurfaceconstitutivecreepmodelandstabilityanalysisofsoftrockroadway1,2,31,2,33LIDong鄄wei,WANGRen鄄he,FANJu鄄hong(1郾TheMinistryofEducationEngineeringResearchCenterofMiningUndergroundEngineering,Huainan摇232001,China;2郾MineBuildingKeyLaboratoryofAnhuiProvince,Huainan
4、摇232001,China;3郾CollegeofCivilEngineeringandArchitecture,AnhuiUniversityofScienceandTechnology,Huainan摇232001,China)Abstract:Thetriaxialcreeptest,afterthefirstconfiningpressureconsolidationandthenunloading,simulatedthestressstatechangesindeepsoft鄄rockroadwayintheexcavationprocess,thro
5、ughthetestsobtained:creepfailureenve鄄lopecanbedescribedbytheMogi鄄Coulombcriterionwithintheexperimentalconfiningpressure;thesoftrockhasaverycleardilatancyontheconditionoflateralunloading,andthevolumetricstrainoccupies10%~20%ofthetotalstrain.Inordertofullyreflecttheextremelysoftrockcree
6、pdeformationlawintheunloadingstate,proposedtheMogi鄄Coulombyieldsurfacerheologicalconstitutivemechanicalmodel,whichconsideredthevolumecreep.ThenumericalsimulationwerecarriedouttothedeepsoftrocktriaxialcreeptestsandtheexcavationprocessofroadwayofonecoalmineinHuainan.Theresultsshowthatth
7、ecreepconstitutivemodelproposedcanprefectlyreflectthesoftrockdilat鄄ancyandvolumetricstrainandothercreepdeformationlaws.Numericalsimulationresultsandmeasuredvaluesareingoodagreement.Keywords:rockmechanics;lateralunloading;soft鄄rockroadway;stabilityanalysis;Mogi鄄Coulombyieldsurface[1]摇摇
8、软岩流变是
