下解放层开采覆岩结构分析及防冲研究

Analysis of overburden strata structure in the lower liberation layer and control measures for rock burst

采用现场调研、理论分析、工程实践方法,研究了华丰矿1410工作面保护层覆岩结构特征及应力分布规律,分析了4号煤层发生冲击地压的原因,优化了1410工作面开采布置,提出冲击灾害监测防治方法。结果表明,1410工作面超前支承压力峰值距工作面的距离约为90m,支承压力峰值约为39.8MPa,倾向支承压力的峰值距煤壁15~18m左右,峰值约为41.1MPa。通过钻屑、微震监测冲击地压方法,采取煤体卸压爆破、顶板预裂爆破及煤层注水防治方法,卸压效果显著,高能量矿震现象消失,保证工作面安全回采。

By means of in-situ investigation,theoretical analysis and engineering practice,the overburden strata structural features and the regularity of stress distribution of 1410 work face at Huafeng Mine were studied,the causes of rock burst occurred in No.4 coal seam were analyzed,optimizing the mining layout of 1410 work face,putting forward the methods of monitoring and controlling of rock burst.The results showed that the distance between the peak advanced abutment pressure and the1410 work face was about 90 m,the abutment pressure peak value was about 39.8 MPa,the peak abutment pressure along the dip was 15~18 maway from coal wall with the peak value of 41.1 MPa.By the methods of drilling cuttings and microseismic rock burst monitoring,taking coal unloading blasting,pre-splitting blasting and coal seam water injection methods,the unloading effect was remarkable,the phenomenon of high-energy rock burst disappeared,which ensured safety mining of work face.