煤岩灾害动力现象危险性预测中的定向定位研究

为了更好地应用非接触电磁辐射方法预测预报煤岩灾害动力现象的危险性，借助于力电耦合方程计算出在天线的各个朝向电磁辐射信号的变化规律及对某一个固定监测点结果的比较，就可以确定出某一个监测点电磁辐射信号的最佳监测方向以及应力变化最大（即危险性最大）的方向；在巷道掘进过程中进行巷道迎头电磁辐射动态监测时，天线测定的位置应该放置在巷道高度方向的中部，并对着煤层层理方向，通过不断改变天线朝向来监测巷道迎头和两帮煤岩层的突出危险性；可以通过应力场数值模拟得出的应力集中区来确定有效预测距离的范围。现场电磁辐射信号测定结果

Research on Direction and Location for Danger Prediction of Coal or Rock Dynamic Disaster

In order to use the non-touch electromagnetic emission(EME) method to better forecast or predict the danger of coal or rock dynamic disaster such as coal or gas outburst,rock or coal outburst and so on,the direction and location of dangerous areas,that is,how to ascertain the monitoring direction and position for EME,is studied.The research results show that according to the computation for the changing rules of EME signals in various directions by means of the coupling equation between EME and stress,and the EME numerical results comparisons for the designated monitored spot,the best monitoring direction and the direction with most stress or maximum dangers can be ascertained.When dynamically monitoring the EME signals in tunnel head-on in the course of tunnel excavation, the monitoring antenna should be laid at the middle height of tunnel and faced with the coal stratum direction.The outburst danger can be monitored by altering the antenna monitoring direction.The available scope of prediction distance can be determined in light of the stress concentration ascertained by numerical simulation for stress field.The EME measuring results on the spot show that it is feasible to study the direction and location of dangerous areas in predicting the danger of coal or rock dynamic disaster by means of the coupling between EME and stress.