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针对哈拉沟煤矿12201工作面切顶卸压沿空留巷工程所设计的预裂切缝,保证切断其顶板应力传递,并且顺利切落成巷,通过理论计算结合工程实际设计出合理的切缝高度范围和角度范围,并利用数值模拟进行验证从而确定出最合理的切缝高度和切缝角度,通过现场试验得出最为合理的钻孔间距,从而确定出针对哈拉沟煤矿12201工作面切顶卸压沿空留巷最优的切缝设计方案。
According to the design of prefracing slits in top clearance pressure relief gob-side entry in Halagou coal mine 12201, it is ensured to cut off the stress transfer of the top plate and cut off into the lane smoothly. The reasonable seam design is made through theoretical calculation and engineering practice Height range and angle range, and verified by numerical simulation to determine the most reasonable height of the kerf and the angle of the kerf. Through the field test, the most reasonable interval of the borehole was obtained, so as to determine the optimal cut for the 12201 face cut in the Halagou Mine Top pressure relief gob-side entry lane optimal cutting design.