包體破裂機制的數值模擬研究.pdf

1、東北大學碩士學位論文包體破裂機制的數值模擬研究姓名：劉庭金申請學位級別：碩士專業(yè)：采礦工程指導教師：唐春安2000.12.1^東北大學碩士學位論文：包體破裂機制的數值模擬研究_l_ll__l—_●_l__l●l_●_一ABSTRACTThesehazardssuchasrockburstsandearthquakesfrequentlyexperiencedinnaturelincludingthedeformationanddamag

2、easwelasfailureprocessofrockmedium，arethemacromanifestationofrockfracturingandfailureprocessBecauseinclusionisthepreconditionofrocklocalizeddeformation，theresearchonitsfracturemechanicsismoreandmoreemphasized，andhasallut

3、mostimportanttheoreticalandpracticalsignificationfofpreventingandforeseeingthesehazardsThefollowingstudyworkhasbeendonebyusingRFPA20code，whichisrecentlydevelopedinourresearchcenterundertheconsiderationofrockmaterialsprop

4、ertiesofheterogeneityandweakness1Thenumericalsimulationonrocksampleswithinclusionsofdifferentelasticmoduleshowsthat：withtheincreaseofelasticmoduleofinclusioninclusion療acturehasallincreasedtrendwhilethedisplacementaswella

5、smaximaIloadingcapacityatmainfracturehasadecreasingtrend；lowstressconcentrationareaischangedfrominclusionanditstopaswellasitsbottomareatotwosidesofinclusion2Thenumericalsimulationoninclusionsampleswithdifferentstrengthsh

6、owsthat：withtheincreaseofinclusionstrengthmainfracturedisplacementloadhasanincreasingtrendwhileinclusionfractureaswellasinclusionacousticemissionhasadecreasingtrend；forthelowelasticseriesitsmaximaIloadingcapacityhasallin

7、creasingtrend，whileforthehighelasticseriesrocksamplereachesitsmaximalloadingcapacitywhentheelasticmoduledifferencebetweeninclusionandrocksampleissmallest3Thehumericalsimulationonsixdifferenttypicalcracksshowsthat：thoughd

8、irectionsoforiginalcrackspropagationmightbedifferent，theirfinalpropagationdirectionwillbethesamewiththedisplacementcontrolled10adingdirectionAmongthesetypicalcragks，theclockwiseWcracksmainfraL：tureismostdimculttobereache