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考虑界面倾角及分形特性的组合煤岩体强度及破坏机制分析.docx

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考虑界面倾角及分形特性的组合煤岩体强度及破坏机制分析 Abstract Inthisstudy,weinvestigatethestrengthandfailuremechanismofacombinedcoal-rockmassconsideringtheinterfaceinclinationandfractalcharacteristics.Basedonthenumericalsimulationsusingthedistinctelementmethod(DEM),wefoundthattheangleofinclinationoftheinterfaceandthefractaldimensionhaveasignificantimpactonthemechanicalbehaviorofthecombinedcoal-rockmass.Theresultsshowthattheincreaseintheinterfaceinclinationangleresultsinthedecreaseofstrengthandtheformationofalocalizedfracturingzone.Incontrast,theincreaseinthefractaldimensionleadstoanincreaseinthestrengthandtheformationofamoredistributedfracturingzone.Furthermore,weanalysethedeformationandfailuremodesofthecombinedcoal-rockmassandfoundthattheyarecloselyrelatedtotheinterfaceinclinationandfractaldimension. Introduction Combinedcoal-rockmassesarecommoninminingengineeringandcivilengineering,inwhichcoalandrockarecloselycombinedandformacomplexmechanicalbehavior.Theinterfacebetweencoalandrockplaysanessentialroleinthemechanicalbehaviorofthecombinedcoal-rockmass.Theinclinationangleoftheinterfaceandthefractalcharacteristicsofthecontactsurfaceshavebeenidentifiedasimportantfactorsaffectingthemechanicalbehaviorofthecombinedcoal-rockmass.Thestudyofthemechanicalpropertiesandfailuremechanismofthecombinedcoal-rockmassisofgreatsignificanceforthesafetyandstabilityassessmentoftheengineeringprojects. Thedistinctelementmethod(DEM)isapowerfulnumericalanalysismethodforsimulatingthemechanicalbehaviorofdiscretemedia,andithasbeenwidelyusedinthestudyofrockmechanicsandminingengineering.Inthisstudy,weusetheDEMtoinvestigatethemechanicalbehaviorandfailuremechanismofthecombinedcoal-rockmassconsideringtheinterfaceinclinationandfractalcharacteristics. Methodology Thecombinedcoal-rockmassissimulatedbasedonatwo-dimensionalDEMmodelconsistingofsphericalparticles.Thecoalandrockparticlesareseparatedbyaplaneinterface,andthecontactsurfacesarecharacterizedbythefractaldimension.Theinclinedangleoftheinterfaceiscontrolledbytheinclinationang