Dynamic Disaster Forecasting Technology of the Island Working Face in Outburst Coal Seam

Abstract

Coal and gas outburst and rock burst are the main threats of the island working face in outburst coal seam. According to the characteristic of No. 11061 island face in outburst coal seam, Liangbei coal mine, China, the dynamic disaster mechanism of island working face in outburst coal seam was analyzed. Based on the monitor of gas concentration and electromagnetic radiation and hydraulic supports resistance in the 11061 island face, the comprehensive forecasting technology of the island face in outburst coal seam was built, then the critical values of gas concentration and electromagnetic radiation and hydraulic supports resistance are calculated by three-ratio method. Finally, the comprehensive forecasting technology is used in the island working face. The results show that the combined action of gas content and stress induces the dynamic disaster of the island working face in outburst coal seam, and the comprehensive forecasting technology can forecast accurately dynamic disaster in the 11061 island face, which has brought successful engineering experience and distinct economic benefit. It can improve significantly the mine production safety level to research the forecasting technology of the island working face in outburst coal seam.