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针对济三煤矿6305工作面坚硬厚层砂岩顶板难以断裂跨落,采用波兰水力致裂技术进行顶板的致裂。通过对不同孔深的致裂钻孔进行注水致裂,然后观测布置在周围的观测钻孔是否有水流出,以确定最大的致裂半径,根据现场试验验证,最大致裂半径可达6～10 m。同时对比致裂过程前后钻孔的煤粉量,验证了致裂后煤岩体的应力明显降低,从而能有效防止冲击矿压的发生。最后分析微震监测系统SOS接收到的致裂过程矿震波形特点与频谱分布图,得出在致裂过程中会诱发小矿震,震动频率相对较大,能量主要集中在高频部分。
Aiming at the hard thick sandstone roof of 6305 working face in Jiansan Coal Mine, it is difficult to fracture and straddle. The fracturing of roof is carried out by the hydraulic fracturing technology in Poland. According to field test, the maximal cracking radius can be up to 6 ~ 10 mm, and the maximum fracture radius can be up to 6 ~ 10 m. At the same time, the amount of pulverized coal in the borehole before and after the fracturing process was compared to verify that the stress of the coal and rock mass after the fracture is obviously reduced, so that the occurrence of rock burst can be effectively prevented. Finally, the characteristics and spectral distribution of mine shock wave received by SOS in microseismic monitoring system are analyzed. It is concluded that small mine shocks are induced in the process of fracturing. The frequency of vibration is relatively large, and the energy is mainly concentrated in the high frequency part.