掘进巷道煤体瓦斯特征与震波频率特性研究

Study on Advancing Roadway Coal Mass Gas Features and Seismic Wave Frequency Characteristics

通过多次在突出煤层掘进巷道迎头进行震波探测试验,并使用频谱分析和时频分析技术得到各巷道的单道震波信号的频率参数,对比分析各条巷道对应的瓦斯检验参数,建立起煤体瓦斯绝对涌出量与震波频率参数的关系:震波能量主要集中在两个独立的频率域内,高频区和低频区分别对应了震波的主频和次主频;随着煤体瓦斯含量的增大,震波的主频和次主频相应降低,且次主频对瓦斯含量的变化更为灵敏。利用震波频率参数预测掘进巷道迎头附近瓦斯含量,可为瓦斯突出危险性预测提供一种新的参数。

Through multiple seismic wave detective tests at the outburst coal seam heading face, and using spectrum and timefrequency analysis techniques obtain roadway single channel seismic signal frequency parameters. Contrastively analyze roadway corresponding checked parameters and establish relationship between coal mass gas absolute emission and seismic wave frequency parameters. Seismic wave energy is mainly concentrated in two independent frequency domains： high frequency and low frequency regions corresponding seismic wave basic frequency and secondary basic frequency respectively. Along with gas content in coal mass increasing, basic frequency and secondary basic frequency decreasing correspondingly and basic frequency will be more sensitive to gas content variation. Using seismic wave frequency to predict gas content near the advancing roadway heading face can provide a new parameter in gas outburst hazard prediction.