矿井煤岩动力灾害声发射监测适用条件初探

Preliminary study on the application conditions of acoustic emission monitoring dynamic disasters in coal and rock

基于应力波传播理论、品质因子Q理论,建立了煤岩体声发射传播理论模型,并结合大量现场试验,得出了声发射在不同普氏坚固性系数的煤岩介质中的传播规律;基于此规律及现场实际监测工艺,初步确定了声发射监测煤岩动力灾害的适用条件:当煤的普氏坚固性系数fp<0.2时,声发射传感器宜安装在顶板岩层内;当煤的普氏坚固性系数fp≥0.2时,声发射传感器可安装在岩体内,也可安装在煤体内。

Based on the stress wave propagation theory and quality factor Q theory,the AE propagation theoretic model was established.And combined with the many field tests,the AE propagation laws in coal and rock with the different Protodrakonov scale of hardness were found.Based on these propagation laws and monitoring techniques in the field,the application conditions of AE monitoring dynamic disasters in the coal and rock were preliminarily given,which can be described that,when the Protodrakonov scale of hardness of coal is smaller than 0.2,AE sensors must be installed in the roof rock;when the Protodrakonov scale of hardness of coal is not less than 0.2,AE sensors can be installed in the roof rock or in the coal.