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《下保护层开采上覆煤岩体采动效应及卸压范围扩界研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第4O卷第3期矿业安全与环保Vo1.40No.32013年6月MININGSAFETY&ENVIRONMENTALPROTECTIONJun.2013刘彦伟,李国富.下保护层开采上覆煤岩体采动效应及卸压范围扩界研究[J].矿业安全与环保,2013,40(3):1—5文章编号:1008—4495(2013)03-0001-05下保护层开采上覆煤岩体采动效应及卸压范围扩界研究刘彦伟,李国富(1.中国矿业大学安全工程学院,江苏徐州221116;2.江苏省安全生产科学研究院,江苏南京210042)摘要:基于FLAC如数值模拟方法,研究了下保护层开采上覆煤岩体的采动效应,得出下
2、保护层开采上覆煤岩体的应力分布特征、位移变化规律和被保护层的卸压范围。研究结果表明,上覆煤岩体卸压程度、应力集中程度和卸压范围均与层间距有关,层间距越大,卸压程度和应力集中程度均越小,最大应力集中位置越倾向于采空区,相应的卸压范围也越小。从应力应变和瓦斯流动角度,将被保护层进行了划分,并对上覆煤岩体的水平移动规律进行了总结。工程实践表明,在非充分卸压区施工密集钻孔,经较长时间的强化抽采,可消除非充分卸压区的突出危险性,达到被保护层扩界的目的。关键词:下保护层;采动效应;卸压范围;扩界工程中图分类号:TD712文献标志码:A网络出版时间:2013-05—2009:51网
3、络出版地址: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
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