基于高瓦斯煤层保护层开采的煤矿水害防治技术

第43卷第5期煤田地质与勘探Vol.43No.52015年10月COALGEOLOGY&EXPLORATIONOct.2015收稿日期:2014-07-09基金项目:(51034003)(2012BAC10B03)作者简介:(1985)[e-mail]引用格式:.[J].201543(5)57–60.文章编号:1001-1986(2015)05-0057-04基于高瓦斯煤层保护层开采的煤矿水害防治技术牟林(中煤科工集团西安研究院有限公司，陕西西安710077):晋煤集团赵庄矿3号煤层为高瓦斯煤层，瓦斯抽采难度大，存在煤与瓦斯突出的安全隐患，防治水方面还存在底板带压开采问题，严重制约了矿井安全高效生产。通过提出保护层开采方案，先期开采下伏8–1号薄煤层，释放3号煤层应力，增加煤层透气性，同时制定8–1号煤带压开采的防治水技术策略，最终实现了3号煤瓦斯安全疏放抽采，防治水工作顺利开展，对同时存在高瓦斯和承压水上采煤问题的类似矿井具有指导意义。：煤与瓦斯突出；保护层；带压开采；防治水：TD741：ADOI:10.3969/j.issn.1001-1986.2015.05.014TechnologyofwaterhazardcontrolwithprotectionlayerforgassycoalseamMOULin(Xi′anResearchInstitute,ChinaCoalTechnologyandEngineeringGroupCorp,Xi′an710077,China)Abstract:Thecoalseam3inZhaozhuangmineofJinCoalGroupisahighlygassyseam,gasdrainageisdifficult,thereexisthiddenunsafehazardofcoalandgasoutburst,alsotheproblemofminingunderwaterpressure,re-strictingseriouslythesafeandhighlyefficientproductioninthemine.Puttingforwardaschemeofminingwithprotectionlayer,thepaperproposedtominethethinseam8–1firstly,toreleasethestressofcoalseam3,toincreasethegaspermeabilityofcoalseam,toformulatethestrategyofwatercontrolforseam8–1incaseofminingunderwaterpressure.Ultimatelythesafegasdrainageinseam3wasrealized,theworkofwaterhazardcontrolwentwell.Thiscasehascertainguidingsignificanceforengineeringpracticeinthesimilarcoalmineswithhighgasandminingaboveconfinedwater.Keywords:coalandgasoutburst;protectionlayer;miningunderwaterpressure;waterhazardcontrol3153“”25%11%~15%331矿井地质及水文地质条件3·58·煤田地质与勘探第43卷328–130.0045~18.4L/(s·m)1~4.8MPa130m1qhk1Fig.1Hydrogeologicalcolumnarsection23号煤被保护层开采技术可行性2.1()[1-4]→→→→→→2.22.2.18–1号煤作为下保护层开采可行性a.下保护层最小有效垂距与实际距离的计算AQ10502008[5]H=KMcosa(a60°)M0.86maa=5°KK=10M=0.86mH=8.57m39mb.下保护层最大有效垂距与实际距离的计算[5]S=S`β1β2S`120mM0M0=0.4mβ1MM0β1=1ηβ2()η50%β2=1120m39m32.2.22号煤作为上保护层开采可行性S=S`β1β28–1M0=0.4mS`=56mβ1=1β2=1S=56m239.40~35.13m18.6m2328–13第5期牟林:基于高瓦斯煤层保护层开采的煤矿水害防治技术·59·3赵庄矿3号煤被保护层开采水文地质条件评价3.18–138–1338–138–1HmHli[6-7]m1002.24.719MHMli1005.61.63.6MHM∑M1~3m15m8–10.86mHm=1.3~5.7mHli=10.8~22.0mHm+Hli=12.1~27.7m8–1339m38-133.2233232330~6.35m4.69m3Hm=9.1~13.5mHli=36.3~47.6mHm+Hli=45.4~60.1m3218.6m33342号煤与8–1号煤保护层的对比与选取4.18-18–1338–138–138–138–14.22233232324.38–18–18–1335赵庄矿开采3号煤瓦斯抽采与水害防治策略5.18–128–112.1~27.7mK5K6K735.238–138–13·60·煤田地质与勘探第43卷2Fig.2Schematicdiagramoftheplanofgasandwaterhazardcontrolinroof8–1K4K3K238–1K4K3K28–138–1()35.335.3.1采用沿空留巷的方式布置8–1号煤工作面8–138–18–15.3.28–1号煤保护层水害防治策略a.8–1号煤巷道掘进时瓦斯抽放与水害防治措施K5K6K738–13(2)()b.回采8–1号煤前的防治水技术措施8–1c.8–1号煤回采过程中的日常水害监测36结论a.38–1()b.c.d.8–13e.参考文献[1].[S].2009.[2].[J].201142(2)23–26.[3].[J].200836(1)44–48.[4].[J].200634(4)33–35.[5].AQ10502008[S].2010.[6].[S].2000.[7].[S].2011.(责任编辑张宏)