华丰煤矿微震监测与冲击地压影响因素分析

Monitoring of Micro Seismic and Analysis on Influence Factors of Strata Bumping in Huafeng Mine

针对华丰煤矿1410工作面冲击地压常发生在工作面推进至见方、来压、煤柱和断层影响区域,研究了工作面见方、来压、煤柱、断层4个影响因素与微震监测的关系。研究表明：工作面距见方位置40~60 m时冲击危险性开始增加,见方位置处危险程度最大;周期来压期间冲击危险性要明显大于其他时期;煤柱对冲击地压的影响可达50 m以上,距煤柱10~20 m时,危险程度最大,距断层40~60 m时,受采动应力与构造应力相叠加,冲击危险性加大。最后采用矩法估计法计算分析,得出了华丰矿六煤遗留煤柱对冲击危险性影响最大,权重系数为0.389,断层次之,为0.326,来压和见方影响相对较小,分别为0.153和0.132。经计算得出了冲击危险性的综合评价指数,同时结合微震监测结果,可实现对冲击地压的预测与评价。

According to the strata bumping of the No.1410 coal mining face in Huafeng Mine often occurred when the coal mining face advanced at the square（means the advanced length of the face and the face length equalized）,strata pressurized,coal pillar and fault influence area,the paper studied the relationship between the four factors of the face in square,strata pressurized,coal pillar and fault and the micro seismic monitoring and measuring.The study showed that when the coal mining face in a square location of 40~60 m,the bumping danger would be high.During the periodical strata pressurized period,the bumping danger would be higher than other time period.When the coal mining face with a distance of 10~20 m to the coal pillars and a distance of 40~60 m to the fault,the mining stress and the tectonic stress would be in superposition and the bumping danger would be high.In the final,the calculation and analysis with the moment method and the estimation method showed that the coal pillars left in the No.6 seam of the Huafeng Mine would have a highest influence to the bumping dangers with a weight coefficient of 0.389,the fault would be the second with a weight coefficient of 0.326 and the strata pressurized and square would have a less influence with a weight coefficient of 0.153 and 0.132 individually.With the calculation,the comprehensive evaluation index of the bumping danger was obtained.And in combination with the seismic monitoring and measuring results,the prediction and evaluation on the strata bumping could be made.