声发射预测技术在石门揭煤过程中的应用与效果分析

Application and Effect Analysis of Acoustic Emission Prediction Technology in the Process of Rock Cross-cut Uncovering

为了提高石门揭煤突出危险性预测结果的准确性及可靠性,弥补"点"预测技术的局限,以大湾煤矿西井X10903工作面运输巷为试验地点,通过对声发射监测信号的时谱频谱图分析,以及声发射特征参数的变化规律研究,对声发射预测技术在巷道掘进期间石门揭煤过程的应用进行效果考察。结果表明:孔底安装传感器的工艺可有效隔离安装位置附近的干扰信号,基于主频分布、波形、波长等因子判别可对声发射监测信号进行有效滤噪;石门揭煤过程中基于声发射特征参数的突出危险性预测结果与工作面实际相符,且监测信号与工作面突出预测指标、放炮作业后瓦斯浓度保持着一致的变化趋势,说明声发射预测技术可应用于石门揭煤突出危险性预测,为生产矿井石门揭煤突出危险性预测提供了一种新的辅助判识方法。

In order to improve the accuracy and reliability of coal and gas outburst prediction results in rock cross-cut uncovering,and make up for the limitations of“spot”forecasting technology,taking X10903working face of west well in Dawan Coal Mine as the test site,by analyzing the time spectrum and spectrum of acoustic emission monitoring signal and studying the variation rule of acoustic emission characteristic parameters,the application of acoustic emission prediction technology in rock cross-cut uncovering during roadway tunneling was investigated.The results show that the process of installing the sensor at the bottom of the hole can effectively isolate the interference signal near the installation position,based on the discrimination of frequency distribution,waveform and wavelength,the acoustic emission monitoring signal can be effectively filtered;the coal and gas outburst prediction results based on acoustic emission characteristic parameters in the process of rock cross-cut uncovering are consistent with the actual,moreover,the monitoring signal is consistent with the index of coal and gas outburst prediction in working face and the gas concentration after blasting,it is indicated that acoustic emission prediction technology can be applied to gas outburst prediction results in rock cross-cut uncovering,and provides a new auxiliary method for coal and gas outburst prediction in rock cross-cut uncovering of production mine.