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1、http://www.paper.edu.cnNumericalAnalysisofBearingPressure1ofOverbrokenRockMassofGobArea*WeiqunLiuXiexingMiaoSchoolofSciencesChinaUniversityofMiningandTechnologyXuzhou,P.R.China221008wqliu@cumt.edu.cnandxxmiao@cumt.edu.cnAbstractTheoverbrokenrockmassofgobareaismadeupofbrokenandaccumulatedr
2、ockblockscompressedtosomeextentbytheabovestrata.Thebearingpressureofgobcandirectlyaffectthesafetyofminingfield,formationofroadretainedalongnextgoaf,andseepageofairandmethaneofgob.Inthispaper,thesoftwareRFPA’2000isusedtoconstructnumericalmodels,andespeciallytheEulermethodofcontrolvolumeisp
3、utforwardtosolvethesimulationdifficultycomefromplasticallyfinitedeformation.Theresultsshowthatthreecharacteristicregionsoccurredingobarea:(1)Naturallyaccumulatedregion,0~10mfarfromunbrokensurroundingrockwalls,thebearingpressurenearlybeingzero;(2)Overcompactedregion,10~20mfarfromunbrokenwa
4、lls,thebearingpressureresultinginthemaximumvalue;(3)Stablecompactionregion,morethan20mfarfromunbrokenwallsandoccupyingabsolutemajorityofgobarea,thebearingpressuresbasicallyhavingnodifferencethere.1IntroductionTheoverbrokenrockmassofgobareaisdifferentfromtheusualporousandfracturedrockmasse
5、s.Itismadeupofbrokenandaccumulatedrockblocks,whicharecompressedbytheabovestrataandincompactiontosomeextent.Experimentsshowthatoverbrokenrockmassesgenerateplasticallyfinitedeformationundersurroundingpressure.Tocalculatethebearingpressureofoverbrokenrockmassofgobarea,whichappearsduetotheabo
6、vestrataself-gravitationandrelativeactivity,andwhichexercisesdirectinfluencesonthesafetyofminingfield,formationofroadretainedalongnextgoafandseepageofairandmethaneofgob[1],theEulermethodofcontrolvolumeisintroducedheretosolvethesimulationdifficultycomefromplasticallyfinitedeformation.Inadd
7、ition,thesoftwareRFPA’2000isemployedtoprovidemodelparametersbypre-calculationandcarryouttheconcretesimulation.1SupportbythekeyNationalNaturalScienceFoundation(No.50134040),theNationalOutstandingYouthFoundation(No.50225414),andthePHDFoundationofEducationalMinistryofC
