徐庄煤矿7431工作面在回采过程中,顶板区域出现大量煤体破碎、局部漏矸、煤壁片帮,严重影响工作面的回采速度。采用现场调研、试验分析和数值模拟等方法,优选出成本低、技术可行的注浆材料和注浆方案。结果表明:耐固Ⅰ号注浆材料能满足端面注浆需要的早强、速凝要求,且成本较低;FLAC3D数值模拟工作面开采过程中超前应力分布规律,在距离工作面0~4m范围内支承压力急剧增加,在6.2m处达到支承压力峰值后逐渐降低,到70m时降低至原岩应力大小。确定注浆位置应设计在0~6.2m的减压区内;采用耐固Ⅰ号注浆材料,并使用“深-浅孔”注浆方法,达到更好的工作面片帮、冒顶的治理效果。

During the stoping process of the 7431 working face in Xuzhuang Coal Mine, a large amount of coal body breakage, local gangue leakage, and coal wall caving occurre in the roof area, seriously affecting the stoping speed of the working face. Adopting methods of on-site investigation, experimental analysis, numerical simulation and so on, low-cost and technically feasible grouting materials and grouting schemes are optimal selected. The results show that the durable solid No. Ⅰ grouting material can meet the early strength and rapid solidification requirements for end face grouting, and the cost is relatively low; FLAC numerical simulation shows the distribution law of advance stress during the mining process of the working face. The support pressure increases sharply within the range of 0-4 m from the working face, it gradually decreases after reaching the support pressure peak at 6.2 m. At 70 m, it decreases to the magnitude of the original rock stress. Determine the grouting position should be designed within the pressure reduction area of 0-6.2 m; Adopting the durable solid No. Ⅰ grouting material and using the "deep-shallow hole" grouting method to achieve better governance effects on the working face wall caving and roof caving.