Research on Grouting Reinforcement Technology for Collapse and Caving Area of the 7431 Working Face in Xuzhuang Coal Mine
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;FLAC3D 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.
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