关键词: 近距离煤层, 采空区, 瓦斯, 煤炭自燃

Abstract: In this paper, to solve the great hidden danger caused by complex disasters of gas and  spontaneous combustion which may exist in the production process of high gas and easily spontaneous combustion coal seam, based on the study of gas occurrence regularity and coal spontaneous combustion characteristics in anomaly gas zones of Fucun Coal Mine, the stereo gas drainage system in condition of “W- type” ventilation mode was established, which containing the staggered high-level gas drainage, bypass tendency high-level gas drainage, and gas drainage near goaf areas, etc. Meanwhile, the “inject-plug” packaged key technology of fire prevention and extinguishing was put forward , in which three-phase foam was used to cover float coal in goaf, noncombustible high multiples curing bubble was used to plug the air leakage location rapidly, nitrogen was injected to make easily spontaneous combustion area inerting, and plastic sodium silicate was injected into the back of hydralic support to stop loopholes and lower temperature, etc. In addition, according to the phenomenon that coal combustion may easily be induced in the gas drainage process, the “drainage-inject” integration method was presented to control the gas and spontaneous combustion in the goaf simultaneously, in which bypass high-level drilling holes were used for gas drainage, and large flow three-phase foam was injected through the gas drainage holes, etc. The key techniques mentioned above were used successfully during the prevention and control of gas and spontaneous combustion in the fully-mechanized sublevel caving face of the lower No.3 coal seam in Fucun Coal Mine, and have achieved remarkable application effects, which effectively solved the gas problems in the coal face and greatly reduced the coal combustion risk in goaf, and can have widely application prospect.

Key words: close-distance seams, goaf, gas, spontaneous combustion of coal