急倾斜特厚煤层开采冲击地压发生过程监测与分析

发布时间：2019-01-27 19:47

【摘要】：为解决急倾斜特厚煤层水平分段开采时的冲击地压问题,采用微震监测系统,确定了两煤层间岩柱中产生的矿震是诱发巷道冲击地压的力源,结合具有高采样频率的冲击地压监测系统进行了冲击震源震波及其响应信号的实测,得出急倾斜特厚两煤层之间岩柱诱发冲击地压的震源信号具有距离工作面近、波形呈现出明显的P波、S波,延时较长,能量较大等特征;震源产生的动载使得煤体应力和锚杆受力瞬间升高,距离震源越近,引起煤体应力变化的幅度越大,煤体垂向应力较水平应力升高更为明显,冲击发生前至少1 h内,煤体应力就已开始发生变化,表现出了一定的冲击前兆特征。研究结果表明,通过震波及其响应信号实测可分析冲击地压发生过程。
[Abstract]:In order to solve the problem of shock ground pressure in horizontal sublevel mining of steeply inclined and extra thick coal seam, using the microseismic monitoring system, it is determined that the mine earthquake produced in the rock pillar between the two coal seams is the force source of inducing the rock burst pressure in the roadway. Combined with the shock ground pressure monitoring system with high sampling frequency, the shock source wave and its response signal are measured. It is concluded that the source signal induced by rock column between two coal seams is close to the working face. The waveform shows obvious characteristics such as P wave, S wave, long delay, large energy and so on. The dynamic load of the source causes the instantaneous increase of the stress of the coal body and the stress of the anchor rod. The closer the source is, the greater the amplitude of the change of the stress of the coal body is, and the vertical stress of the coal body is more obvious than the increase of the horizontal stress, and the vertical stress of the coal body increases more obviously than that of the horizontal stress. The stress of coal has begun to change, showing a certain characteristics of shock precursor. The results show that the process of rock burst can be analyzed by measuring the seismic wave and its response signal.
【作者单位】：天地科技股份有限公司开采设计事业部;中国煤炭学会岩石力学与支护专业委员会;
【基金】：国家自然科学基金资助项目(51304116,51574149)
【分类号】：TD324

【相似文献】