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时间:2017-12-08
《薄煤层上行开采顶板巷道活动规律及支护》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34卷第1期西安科技大学学报Vo1.34No.12014年01月JOURNALoFⅪ’ANUNIⅦRSⅡYOFSCIENCEANDTECHNOI10GYJan.2014文章编号:1672—9315(2014)01—0038—05薄煤层上行开采顶板巷道活动规律及支护潘昌建(四川达竹煤电(集团)有限公司小河嘴煤矿,四川达州635000)摘要:小河嘴煤矿2016(24)工作面为201采区24煤层首采面,24煤层厚度为0.3—0.75m,厚度不稳定,瓦斯含量高,顶板为坚硬的中粒砂岩,在开采时伴有淋水,工作面顶板管理较为困难,月推进度仅为8—30m,长期达不到设计产量,针对以上诸多问题,矿
2、对上行开采进行了可行性研究,确定对顶板巷道的采用“锚杆+锚索+金属网+钢筋梯”的组合支护方式进行了支护。实践表明:上行开采顶板巷道活动可分为起始活动区、强烈活动期和活动衰退期;加强支护后两帮移近量明显减少,顸底板移近量减少不明显,说明巷道顶底板变形以底板变形为主,在锚网索联合支护作用下,使巷道顶板压力向巷道两侧深部转移,降低了两帮压力,利于巷道两帮稳定。上行开采顶板巷道不同支护区项板绝对位移量不大与煤层下沉量相接近,说明上行开采巷道顶板位移较为准确的反映了顶板覆岩的活动情况。关键词:极薄煤层;上行开采;覆岩分区;顶板巷道中图分类号:TD82文献标志码:Ainthinseamasce
3、ndingminingPANChang-jian(LittlehezuiCoalMineofSichuanDazhuCoal(Group)Co.,Ltd.,Dazhou635000,China)Abstract:Coalface2016(24)inLittlehezuiCoalMinebelongstothefirstminingfaceofminingarea201.Thethicknessofcoalseam24isabout0.3to0.75meters。Ithasanunstablethicknesswithhighgas.Theroofissolidmedium—grai
4、nsandstoneandminingwithwatertrickling.Itisrelativelydifficultforthecoalfaceroofmanagement,onlyabout8to30metersf0rfaceadvancepermonth,unabletoreachthedesigncapacityoveralongperiodoftime.Inviewoftheabove,feasibilitystudyforascendingminingisconductedinthispaper.Thenacombinedsupportmethodof“anchor
5、rod+anchorcable+metalmesh+steelladder”isconfirmedtoapplyforrooftunne1.Thepracticeindicatesthatrooftunnelactivityofas—cendingminingcanbedividedintoinitialactivitystage,drasticactivitystageandactivitydeclinestage.Thedeformationamountofrooftunnel’Ssidesisobviouslyreducedafterstrengthenedsupport;t
6、hede-formationamountofroofandfloorislittlereduced,itshowsthatdeformationofroofandfloorismainlyfloordeformation.Theroofpressureoftunnelistransferredtotunnel’Sdeepersidesbymeansofcableanchorcombinedsupport.Thatmeansthepressureofrooftunnel’ssidesisreducedinfavorofstabletunnel’Ssides.Theroofabsolu
7、tedisplacementatdifferentsupportingareaisnotlargeinascendingmin—rooftunne1.It’Sveryclosetotheamountofseamsinkage.Itindicatesthatroofmovementofascend-收稿日期:2013一O5—1O作者简介:潘昌建(1968一),男,重庆荣昌人,工程师,E-mail:892746346@qq.tom第1期潘昌建:薄煤层上行开采顶板巷道活动规
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