煤矿深井动力灾害电荷辐射特征及应用

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Abstract The frequency and intensity of the accidents of rockburst in deep coal mining，coal and gas outburst and other dynamic disasters have been increasing continuously. These types of accidents are often mutual stimulating and transformable，which lead to a very complex mechanism of disaster yielding and difficulties in its monitoring，early warning and prevention. The accurate prediction the type and the grade of dynamic disasters is necessary prerequisite for disaster prevention and curing. During the development process of a dynamic disaster，deforming and fracturing of coal or rock and gas migrating produce a large quantity of electrical charge in coal rock. Studying the characteristics of the information of the charge radiation of different types of dynamic disasters in the breeding process can provide clues to accurately predict the rockburst disaster. A coal charge monitoring system was installed to measure the charge radiation signal in the coal rock around the side roadway ahead of the working face. Measured charge radiation was analyzed. The charge signals were stable and smaller when the working at the normal operating period. Precursory anomalies were visible before the dynamic disaster. The characteristics of the charge signals were prominently different for different forms of dynamic disasters. In the course of outburst，the values of the maximum charge increase with large fluctuations，the values of the minimum charge was nearly zero. For the rockburst in the breeding process，the value of the maximum charge was largely the same with the minimum one varying in a higher level steadily without obvious fluctuation. For the compound dynamic disaster，the maximum values of the charge radiation were at a high level with larger fluctuation and the minimum values of the charge radiation was at a high level relatively stable，which appeared to have both the features of gas outbust and rockburst. Therefore，the charge radiation of the coal rock can be used not only to forecast the dynamic disaster risk of coal and rock，but also to judge the type of disaster for the control measures to be taken accordingly.

Key words： mining engineering dynamic disaster prediction coal charge rockburst coal and gas outburst

Received: 08 November 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I8/1619

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