底抽巷穿层钻孔实施煤层巷道超前钻探技术研究

Study on the implementation of coal seam roadway over-drilling technology by bottom extraction roadway through layer drilling

以长平煤矿3号煤层为例,设计了煤巷超前探测的基本原则与探测方案,论证了底抽巷穿层钻孔实施煤巷超前探放的安全可行性。研究结果表明,依据井田地质条件,井田3号煤层巷道掘进可划分为安全区域、受水威胁区域和异常区;制定在“安全区域”巷道超前探放孔控制超前距≥30 m、帮距≤25 m的探测方案;底抽巷穿层钻孔完全覆盖3号煤层巷道帮距20 m、超前距30 m的要求,在“安全区域”底抽巷穿层钻孔实施煤层巷道超前钻探技术是安全可行的。研究结果提高了矿井安全生产效率,具有明显的经济效益。

No.3 coal seam of Changping Mine was taken as an example,the basic principles and detection scheme of coal roadway over-detection were designed,and the safety feasibility of implementing coal roadway over-detection and release by bottom pumping roadway through seam drilling was demonstrated.The research results showed that according to the geological conditions of the well field,the No.3 coal seam roadway can be divided into safe area,water threatened area and abnormal area;the detection plan of controlling the overrun distance≥30 m and sides distance≤25 m in thesafe area roadway overrun detection and release hole was formulated;the bottom pumping roadway penetration hole completely covered the requirement of 20 m side distance and 30 m side distance of No.3 coal seam roadway.The study results showed that it was safe and feasible to implement coal seam roadway over-drilling technology in the safe area with the requirement of 30 m over-distance in the bottom extraction roadway.The results of the study improved the mine safety production efficiency,with obvious economic benefits.