Research and application of integration technology of solid particle secondary sealing

In order to solve the problem that the gas concentration is greatly reduced due to the development of fissures around boreholes and the connection with the outside after a period of time in the process of gas extraction by boreholes.On the basis of the original secondary sealing method, the integrated technology of secondary sealing is put forward.Expounds the principle of the integration of secondary sealing, establishes a numerical analysis model of the influence of coal (rock) fissure characteristics on gas extraction quality, and analyses the influence of fissure width and fissure spacing between the mining affected area and the original coal body on gas extraction quality.And a preliminary industrial test was carried out on the transport roadway of 21129 working face and 1137 working face in Shanjiaoshu coal mine in Panjiang mining area.The results show that the average gas concentration can be increased by 23.3% in Shanjiaoshu coal mine, the validity period of gas extraction can be extended by 24 days, the average gas concentration can be increased by 17.2% in Jinjia coal mine and the validity period of gas extraction can be extended by 22 days.Providing a reference for safe and efficient mining of high gas coal seam in Guizhou mining area.