上保護層開采煤巖變形與卸壓瓦斯抽采技術研究.pdf

1、安徽理工大學碩士學位論文上保護層開采煤巖變形與卸壓瓦斯抽采技術研究姓名：高明松申請學位級別：碩士專業(yè)：安全技術及工程指導教師：石必膽20110606安徽理T大學碩十學位論文AbstractInthispaperthecombinedmethodsoftheoreticalanalysis，similarsimulationtestandfieldtrialsaleusedThestressdistributioncharacterist

2、ic，fracturedevelopmentLawpermeabilityvariationpropertiesofunderlyingcoal—rockmass，stillwiththegasflowlawoflowerprotectedlayerandpressure—reliefgasextractiontechniqueunderupperprotectivelayerminingarestudiedsystematically

3、Theresearchhasanimportantsignificanceforsafetyandefficientproductionundersimilarexploitationconditionsoflowpermeability、枋廿lhighgasandoutburstriskcoalseamThestresschangemechanicalmodelforunderlyingcoalrockmassofstopeWasfo

4、undedinthepaperStressformulaiSderived，combinedwiththenumericalsimulationweobtainthesresschangeanddistributionlawofunderlyingcoal—rockmasWeanalyzethethedeformationlawandfracturedevelopmentcharacteristicsofunderlyingcoal—r

5、ockmassmovement研tllminingproceedingahead，ThetotalfloorcoalandrockexperiencescompressiondeformationfirstthenexpansiondeformationandrecompactionofthecontinuousperiodicdestructionBasedondifferentdevelopmentcharacteristicsan

6、dstatusofofunderlyingcoal—rockmass，theunderlyingcoalrockmassunderaneffectofupperprotectivelayerminingWasdividedintothefloorheavefracturezoneandthefloorheavedeformationzoneinthispaperThepermabilitycoefficientofchangelawof

7、underlyingthecoalseamasfollows：Theoriginalvalue’smallydecreasingincreasinggreatlyreducingstabilityatlastTransportcharacteristicsoncoalseamgasareasfollow：desorptiondiffusion—nowBasedonthecharacteristics，weanalyzethecrackf

8、ieldintheminingandgaslawofthecouplingflowfieldinthepaperThefieldtestforupperprotectivelayerminingofZhangJicoalmineofHuaiNanshowsthattheeffectofpressurereliefofprotectedseamisverygoodAndthemaximumswellingdeformationquanti

9、tyof6mcoalseamofprotectedseamis16ITIITI，themaximumswellingdeformationrateis4％，permeabilitycoefficentwhichincreases660foldisfrom0054m2／Maadto3544m2／MPa2dTheradiusofpressurereliefgasextractionof6coalmilleis20mItusesgasextr