Technology and Practices on Mine Pressure Bumping Prevention and Control of Fully Mechanized Top Coal Caving Mining in Ultra Thick Seam

According to the serious mine pressure bumping, gateway repair difficultyt and other production problems of No.250102 fully mechanized top coal caving mining face in Huating Mine, a series technical research and the prevention and contral practices was conducted.The analysis showed that the deep mining depth, sea m with pressure bumping tendency, hard and thick sandstone roof and irrational width of the gateway coal pillars would be main influence factors to cause the pressure bumping in the coal mining face.The comprehensive index was applied to judge the pressure bumping danger index as 0.89 of the fully mechanized top coal caving mini ng face and the mining face would have a strong pressure bumping danger.Based on the early prediction, the micro seismic method was applied to monitor and measur e the bumping danger zone.As for the bumping danger zone, the pressure releasing blasting in the gateway side wall, deep borehole blasting in the roof, dynamic water injection (813 MPa) and static water injection as well as other pressure releasing and danger control measures were comprehensively applied to reduce the mine press ure bumping behavior strength and to effectively reduce the pressure bumping occurred in the fully mechanized top coal caving mining face.