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1、第4O卷第3期礦業(yè)安全與環(huán)保Vo1.40No.32013年6月MININGSAFETY&ENVIRONMENTALPROTECTIONJun.2013劉彥偉,李國富.下保護(hù)層開采上覆煤巖體采動效應(yīng)及卸壓范圍擴(kuò)界研究[J].礦業(yè)安全與環(huán)保,2013,40(3):1—5文章編號:1008—4495(2013)03-0001-05下保護(hù)層開采上覆煤巖體采動效應(yīng)及卸壓范圍擴(kuò)界研究劉彥偉,李國富(1.中國礦業(yè)大學(xué)安全工程學(xué)院,江蘇徐州221116;2.江蘇省安全生產(chǎn)科學(xué)研究院,江蘇南京210042)摘要:基于FLAC如數(shù)值模擬方法,研究了下保護(hù)層開采上覆煤巖體的采動效應(yīng),得出下
2、保護(hù)層開采上覆煤巖體的應(yīng)力分布特征、位移變化規(guī)律和被保護(hù)層的卸壓范圍。研究結(jié)果表明,上覆煤巖體卸壓程度、應(yīng)力集中程度和卸壓范圍均與層間距有關(guān),層間距越大,卸壓程度和應(yīng)力集中程度均越小,最大應(yīng)力集中位置越傾向于采空區(qū),相應(yīng)的卸壓范圍也越小。從應(yīng)力應(yīng)變和瓦斯流動角度,將被保護(hù)層進(jìn)行了劃分,并對上覆煤巖體的水平移動規(guī)律進(jìn)行了總結(jié)。工程實(shí)踐表明,在非充分卸壓區(qū)施工密集鉆孔,經(jīng)較長時間的強(qiáng)化抽采,可消除非充分卸壓區(qū)的突出危險性,達(dá)到被保護(hù)層擴(kuò)界的目的。關(guān)鍵詞:下保護(hù)層;采動效應(yīng);卸壓范圍;擴(kuò)界工程中圖分類號:TD712文獻(xiàn)標(biāo)志碼:A網(wǎng)絡(luò)出版時間:2013-05—2009:51網(wǎng)
3、絡(luò)出版地址:http://www.cnki.net/kcms/detail/50.1062.TD.20130520.0951.002.htmlStudyonMiningEfectofOverlyingCoalandRockMassandBoundaryExpansionofPressure-reliefRangeafterExtractionofLowerProtectiveSeamLIUYanweii一.LIC~ofu2(J.FacultyofSafetyEngineering。ChinaUniversityofMiningandTechnology,Xuzhou2
4、21116,China;2.JiangsuAcademyofSafetyScienceandTechnology,Nanjing210042,China)Abstract:BasedonFLACnumericalsimulationsoftware,researchwasmadeontheminingeffectoftheoverlyingcoalandrockmassaftertheextractionofthelowerprotectiveseam,andthestressdistributioncharacteristicsanddisplacementchan
5、gelawsoftheoverlyingcoalandrockmassandthepressure-reliefrangeoftheprotectedseamwereobtained.Theresearchresultsshowedthatthepressure—reliefde~ee,thestressconcentrationde~eeandthepressure-reliefrangeoftheoverlyingcoalandrockmasswereallrelatedtotheseam.interval,iftheseamintervalwaslarger,t
6、hepressure-reliefde~eeandthestressconcentrationde~eeweresmaller,andifthepositionofthelargeststressconcentrationWasclosertotheg0af,thecorrespondingpressure—reliefrangeWasalsosmaller.Forthisreason,theprotectedseanlwasdividedintoseveralzonesfromtheangleofthestressandstrainorthegasflow,andt
7、hehorizontaldisplacementlawoftheoverlyingcoalandrocknlasswassummarized.Theengineeringpracticeshowedthattodrillcloserholesinthenon-fullpressurereliefzoneandealTyoutpowerfulgasnageforalongtimeCaneliminatethecoalandgasoutbursthazardinthenon-fullpressurereliefzoneandachievethepurpo