Research On Mining Method Of Under Strong Water-bearing Layer In Northern Mining Area Of Mengba Coal Mine

The 100mm thick UDT strong aquifer above the bedrock in the northern mining area of the Balabuulia coal mine in Bangladesh(referred to as the Mengba Mine)constitutes a significant threat to the production of the mine.The lower part is the LDT rock group,which is the main mine Waterproofing group.The LDT in the northern mining area is thin and there is an LDT deletion region.The thickness of the bedrock beneath UDT varies greatly,and the bedrock is thin in some areas.It is very important to study the safe and reasonable mining scheme of the strong water layer,the thin Waterproofing layer and the thin bedrock under the special geological conditions in the northern mining area.Based on the analysis of the structure of the overlying strata in the mining area of the northern mining area,combined with the mining experience in the central mining area,it is determined that the northern mining area is arranged along the 100m bedrock to divid into east and west wings.According to the experience of the adjacent mining area,and the numerical simulation results show that the west wing area should be exploited by the strip mining method,and the long wall mining method is adopted in the eastern wing.Based on the PFPA2Dseepage simulation software,the hydraulic fracturing depth of the bottom bedrock of UDT water body is simulated,and the top of the safety Waterproofing pillar is sured.The horizontal deformation analysis method is used to be sure the weight of working face.To analysis the height of fissure zone,different longwall mining schemes is simulated by numerical simulation method.The reasonable mining parameters of longwall face mining are determined synthetically.Use the pressure arch calculation method,horizontal deformation analysis method,Wilson strength theory to analysis the weight of the strip used for mining,the weight of the releasing strip used for protecting and the stability of the strip,the numerical the numerical simulation method is used to be sure the height of fissure zone of the different strip mining scheme.The parameters of the strip mining are determined synthetically.Based on the results of comprehensive analysis,the mining scheme of mining area in the northern part of Mengba Mine is determined,and technical safety measures is developed.The research results can provide reference for Mengba mining.