Abstract:
For the end-mining and withdrawal work under complicated conditions, including rock burst, large water inflow, a large area of floor heave, high gas and so on, at Kuangou Coal Mine W1121 working face, taking idea of "dividing stages and areas, developing many measures simultaneously, strengthening forecasting and comprehensive treatment" to prevent and control spontaneous combustion, we divide fire-prevention work during end-mining and withdrawal period into two stages. According to the different characteristics of two stages, comprehensive technologies were developped and implemented for coal spontaneous combustion, including forecasting, nitrogen injection, slip casting, wind control and leaking stoppage, drilling hole and Shidafu injection, and optimization of gas drainage system, which achieves the safety retracement of working face.