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针对综放工作面初采期间存在的问题,分析后退式单孔多次压裂技术在综放工作面煤岩体弱化中的作用。通过监测压裂和顶板垮落过程,在潞安五阳煤矿7602综放工作面进行煤岩体水力压裂弱化试验研究。结果表明,针对五阳煤矿7602顶板条件,水压最高可达48.36 MPa,单孔压裂约8次,水力裂缝扩展半径约10 m。压裂后,顶煤冒放性提高、煤层瓦斯得以提前释放、注入水量降低放煤过程中的煤层量。顶板垮落过程未产生冲击,保证初采安全。
Aiming at the problems existing in the first mining of fully mechanized top coal caving face, the effect of the multi-fracturing single hole technology on the weakening of coal and rock mass in fully mechanized caving face is analyzed. By monitoring the process of fracturing and roof caving, the weakening of hydraulic fracturing of coal and rock mass in 7602 fully mechanized coal caving face of Wuyang coal mine in Lu’an was studied. The results show that the water pressure can reach up to 48.36 MPa, single-hole fracturing about 8 times and hydraulic fracturing radius about 10 m for 7602 roof condition of Wuyang Mine. After fracturing, the top coal has increased its releasing capacity, coal gas can be released in advance, and injected water can reduce the amount of coal in the process of caving. Roof collapse process did not produce impact, ensure the safety of early mining.