Abstract: Aiming to solve the problems of coal spontaneous combustion, CO content over limit occurred during the withdraw period of Zhang Shuang-lou coal mine 9427 working area, the geological structure of the coal mining face, coal quantity left, ventilation leakage and other aspects were analyzed. According to the actual conditions of coal mining face and features of each fire prevention technology, a comprehensive technology was applied including pressure balancing, grouting high-water materials through high level boreholes, injecting foam-gel in the boreholes drilled in front of the stents based on the principles of reducing leakage, isolating the oxygen, deleting high temperature areas quickly. The concentration of CO decreased from 1200ppm to 10ppm or less, and finally stabilized to the end of withdraw period.

Key words: Mining stop, Coal spontaneous combustion, Comprehensive fire preventing technology, High-water material