School of Resources and Geosciences,China University of Mining and Technology,Xuzhou　 221116,China

冲击矿压危险性评价与预警中,单纯使用电磁辐射强度值大小或微震能量值都具有一定的局限性。为此,在分析冲击矿压发生的力学环境与能量过程的基础上,提出电磁-震动耦合预警方法,建立评价方法体系,结合具体冲击矿压矿井监测结果,研究冲击矿压前兆规律。结果表明:在冲击矿压发生前,电磁辐射值高出正常值,微震活动表现出能量存在明显的沉寂期,次数却呈上升趋势的规律,利用电磁-震动耦合的静态叠加评价和动态评价与现场冲击前兆具有较高的一致性;而当电磁辐射强度值较高,但是微震活动处于稳定的能量释放状态时,叠加后的综合冲击危险性降低,不会出现冲击矿压危险。

Field investigations and theoretical studies show that the dynamic damage of the coal and rock system is characterized by static-dynamic coupling loads. During the preparation and development of rockburst the electromag- netic emission can represent energy accumulation while microseismic events represent the output of energy which in- dicates microseismicity has a duality of energy release and dissipation. So it is unscientific if the electromagnetic e- mission strength which stands for the energy accumulation and microseism energy that presents energy release are separately used as the criterion for rock burst forecast. Based on energy principles the precursory rules of rock burst are studied in this paper combining with the electromagnetic emission and microseismic monitoring method,the cou- pling evaluation system was established based on the monitoring results of a specific rockburst colliery. The results show the precursory rules that the elec-tromagnetic emission strength is much higher than normal and micro-seismic energy is continuously lower as well as the activity number appears an increase tendency. Rock burst will not occur if the micro-seismic activities are on the steady energy release estate even though the electromagnetic emission strength is higher.

HE Hu,SUN Hao,WANG Qian. Electromagnetic emission-microseismicity coupling evaluation method for rockburst[ J]. Journal of China Coal Society,2018,43(2):364-370.