Study of response regularity of acoustic emission in gas jet orifice
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摘要: 为预防石门揭煤过程中可能诱发的突出危险，基于声发射监测系统，对某矿石门揭煤过程中瓦斯喷孔时的声发射活动进行了测试和分析。分析研究结果表明，声发射强度通常在喷孔发生前2~3 h迅速升高，峰值强度可达到无突出危险时的2~3倍，在喷孔发生前又突降至较低水平；喷孔越严重，声发射强度值越高；声发射强度变化的幅度能够反映喷孔严重性，喷孔动力现象越明显，瓦斯体积分数变化越剧烈，煤岩体声发射强度增长率越大且峰值强度越高。该分析研究结果对石门揭煤中突出危险性的监测预报有重要的参考意义。Abstract: In order to prevent danger of coal and gas outburst in process of rock cross-cut coal uncovering, tests and analysis on acoustic emission in rock cross-cut coal uncovering process in a coal mine were conducted based on acoustic emission monitoring system. The analysis and research results indicates that acoustic emission intensity increases rapidly in 2-3 hours before jet orifice occurred, peak strength can reach 2-3 times higher than that no outburst danger, then dropped to lower level before jet orifice occurred. The more serious the jet orifice was, the higher the intensity of acoustic emission was. The variation range of the acoustic emission intensity could reflect severity of the jet orifice, the more obvious the jet orifice was, the more severe the changes of gas concentration was, the greater the growth rate of coal and rock acoustic emission intensity was and the higher the peak intensity was. The analysis and research results have important reference significance for monitoring and forecasting of coal outburst risk in rock cross-cut coal uncovering.
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