千米深井锯齿形断层煤柱群应力分布及微震活动规律  

Stress Distribution and Microseismic Rules of Zigzag-type Fault-coal Pillars with a Depth of 1000 m

作　　者：张修峰 陆菜平[2] 王超 王保齐 周涛 李欢 贺志龙 ZHANG XiuFeng;LU Caiping;WANG Chao;WANG Baoqi;ZHOU Tao;LI Huan;HE Zhilong(Centre of Rockburst Prevention Research,Yankuang Group;School of Mines,China University of Mining and Technology;Zhaolou Coal Mine,Yankuang Group)

机构地区：[1]兖矿集团煤矿冲击地压防治研究中心 [2]中国矿业大学矿业工程学院 [3]兖矿集团赵楼煤矿

出　　处：《现代矿业》2020年第10期38-41,65,共5页Modern Mining

基　　金：国家自然科学基金面上项目(编号:51574225)。

摘　　要：上部遗留煤柱存在较高的应力集中,会导致下部工作面或巷道应力升高。对于形状不规则煤柱,应力分布更加复杂,从而使下方工作面过煤柱不同阶段的矿压显现规律不同。针对赵楼煤矿千米埋深7301强冲击危险工作面上部存在锯齿形断层煤柱群的实际情况,采用数值模拟和现场监测手段,研究了各煤柱对工作面应力集中的影响范围及工作面过煤柱群下方的微震活动规律。结果表明:①煤柱内应力峰值及煤柱与工作面相对位置是决定其对工作面影响范围和强度的重要因素,煤柱应力峰值较小及煤柱距工作面较远时均对工作面影响较小;②工作面回采接近煤柱边缘及煤柱交界处时,微震能量和频次均会达到峰值,相应微震大能量事件的振幅增加,主频降低,能量主要集中在低频区,此时工作面的冲击地压危险性最高;③根据震源定位及现场卸压情况,确定煤柱边缘及交界处是高应力集中区,需采取大直径钻孔卸压,以达到降低应力集中的目的。The high stress concentration in the upper coal pillar will lead to the increase of stress in the lower coal seam working face or roadway.The stress distribution in the coal pillar will become more complex due to the irregular shape of coal pillar,which makes the strata behavior regularity appear abnormal in different mining stages under coal pillar.Based on the upper Zigzag-type coal pillar encountered in the 7301 working face with a strong probability of rock burst of Zhaolou Coal Mine,through numerical simulation and field monitoring,the area affected by pillar in lower working face,the strata behavior regularity,the variation rule of microseismic(MS)energy and frequency were analyzed when working face advance to area affected by coal pillars.The results show that:①The stress peak value of coal pillar and Relative position of coal pillar and working face are the important factors to determine the influence range of coal pillar on the working face,coal pillar have the smaller influence on the working face with the smaller stress peak value and far away from the working face.②When the working face is close to the edge and the junction of coal pillar,the MS energy and frequency will reach the peak value,and the amplitude of corresponding MS large energy events will increase,the dominant frequency will decrease,and the main energy will be concentrated in the low-frequency area.At this time,the working face has the highest risk of rockburst.③According to the location of the source and the field depressurizing situation,it is determined that the stress concentration area is located at the area under the edge and the junction of the coal pillar.Therefore,the large-diameter borehole should be adopted for reducing the stress concentration.

关 键 词：千米深井 不规则煤柱 应力集中和传递 微震监测 卸压 

分 类 号：TD82[矿业工程—煤矿开采]