摘要
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。
In order to address the problem that the hard thick sandstone roof of 6305 working face in Jisan Coal Mine is difficult to fracture,hydraulic fracturing technique introduced from Poland was adopted to cut off the roof.First pressure water was injected to test holes with different drill hole depth and the maximum crack radius was determined through investigating whether there was water flowing from the observation holes arranged around test holes.Field test verification reveals that the maximum crack radius can reach 6～10 meters.Meanwhile the decline of pulverized coal from drilling suggested that the stress in coal mass decreased significantly after fracturing,thus hydraulic fracturing can reduce rockburst danger effectively.Additionally,it is concluded that hydraulic fracturing will induce micro seismicity of higher vibration frequency and whose energy mainly concentrated in the high frequency part through analyzing waveform characteristics and spectral distribution of seismicity monitored by Seismological Observation System（SOS） in the process of fracturing.
出处
《煤矿安全》
CAS
北大核心
2011年第5期16-19,共4页
Safety in Coal Mines
关键词
水力致裂
坚硬顶板
微震监测
波形分析
hydraulic fracturing
hard roof
microseismic observation
waveform analysis.
