Yongcheng Coal and Electric Power Group Corporation Limited MOE Key Lab of Deep Coal ResourceMining,China University of Mining and Technology School of Mining Engineering,China University of Mining and Technology

针对厚层软弱泥岩巷道底鼓控制难题,结合顺和煤矿西翼轨道大巷工程地质条件,对比分析了巷道帮顶注浆加固原理和底板注浆加固原理,提出了软弱泥岩巷道底板防止钻孔塌孔的下向深孔施工技术,根据等效开挖的概念确定了合理的底板注浆加固深度及锚注孔间排距参数。结果表明:厚层软弱泥岩巷道采用7.5 m长的底板锚索进行下向深孔注浆加固较为合理,注浆孔排距取2.5 m,间距取1.3 m的效果较好。由于底板浅部岩层软弱破碎程度高,下向一次深孔的难度极大且成孔效果差。先对浅部破碎岩层进行浅孔预注浆,滞后一定时间再进行下向深孔注浆,能够有效降低软弱泥岩巷道下向钻孔的施工难度并提高成孔效果。软弱泥岩底板锚注加固技术在顺和煤矿取得成功应用,巷道底鼓问题得到了有效控制。

Acoding to the dificult conrol problem of the foor heave in the mine thick and sot mudstone roadwayin combination with the engineering geological conditions of the west wing ral tasportation roadway in Shunhe Mline, the roof grouting reinforcement priniple and the foor grouting reinforcement principle of the mineroadiway were compared and analyzed and a downward borehole construction tfechnology of thesof and wealk udstone mine roadwa foorwas proided to prevent te borehole collapsed.According to the equivalent excavation concepton.therational foo groutig reinforcement depth and the row d istance paramneters betveen the bolt and grouting boreh ole spaces were delermined.The resutis showed that using a7.5 m long anchor set dow in the borehole for the anchor grouting was a rational rinforcement method of the foor in the thick sot mudstone roadvay.The optimal row spacing and colunmn spacig of the grouting hole wererespectivel 25 m and 1.3 mDue to the shallow rock stratumo of the foor was broken a deep borehole drlld all a once was extreme ly hard and the borehole formning effect was poo.Therefore a haow borehole pre-grouting was frstly conducted and a deep boreholegrouting would be conducted ater a certin time. This construction method coui fectively redu.ethe foora lig dificulty in sof mudstone roadway and inprove the boreholeforming efftct.The bolt grouting reinforcement technology of the soft mutstone foor was successfully applied to Shunhe Mine and the floor heave problem was effectively controlled.

中央高校基本科研业务费专项资金资助项目(201402B02)；江苏省“青蓝工程”资助项目(JSQL20140207)；江苏省优势学科建设平台资助项目(SZBF2011-6-B35)；