用电磁辐射法监测预报矿山采空区顶板稳定性

Monitoring and forecasting roof stability of goaf by electromagnetic emission

对坚硬煤岩层的电磁辐射特性进行了实验研究,对煤矿回采过程中煤岩体电磁辐射变化规律进行了监测分析,在此基础上提出了电磁辐射监测预报顶板稳定性的技术方法,并在煤矿进行了试验应用.研究结果表明:在矿山采掘过程中,伴随顶板活动会产生明显的电磁辐射信号,顶板垮落前电磁辐射有异常反映,表现为异常增大或呈现增长趋势,用电磁辐射法监测预报顶板垮落是可行的,且具有快捷、方便、准确率高的优点.

Electromagnetic emission （EME） characteristic of hard coal or rock seams was experimentally studied. The change law of EME of coal or rock during stopping was monitored and analyzed, based on which the roof stability EME monitoring technical method was given, and was applied in coal mine. Results indicated that electromagnetic emission will be produced obviously along with the move of roof and EME is abnormal, increasing or presents an increasing trend, before collapse of the roof during the course of mining. Using electromagnetic emission forecasting roof collapse is feasible and with the merits of shortcut, convenient and high accuracy rate.