上保護(hù)層開采煤巖變形與卸壓瓦斯抽采技術(shù)研究.pdf

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