Analysis of Water Disasters Hidden Danger in the Mining of the No.3 Coal Seam in Xin'an Coal Mine of Ningwen Coalfield in Shandong Province
In order to identify the types of water disasters hidden danger in the mining of the No.3 coal seam in Xin'an Coal Mine,analyze the potential threat and spatial distribution characteristics of water hazards to the mine,on-site questioning,data collection,and downhole exploration methods are used to analyze the influence of the atmospheric precipitation and surface water of the coal mine,the Quaternary sand and gravel layer,the Neogene sand and gravel layer,the Cretaceous sandstone,the sandstone on the roof and floor of the No.3 coal seam,the three ash,the tenlower ash,the Ordovician limestone,and the old goaf water accumulation on the mining of the No.3 coal seam one by one.The types of water disasters hidden danger that affect the mining of the No.3 coal seam are identified as the roof and floor sandstone,the Ordovician limestone water,and the old goaf water accumulation of the No.3 coal seam;Using the"total thickness value of the aquifer in the water conducting fracture zone after mining"and the"water inrush coefficient method",the risk of water filling in the roof sandstone and the risk of water inrush in the floor Ordovician limestone in the mining of the No.3 coal seam are classified into levels.It is studied and analyzed that the spatial distribution characteristics of water disasters hidden danger in the mining of the No.3 coal seam are as follows:the water hazards in the roof of the No.3 coal seam mainly affect the central part of the mine,the old goaf water mainly affects the shallow part of the mine,and the Ordovician limestone water mainly affects the eastern part of the mine.
water disaster hidden dangerNo.3 coal seamtotal thickness value of the aquifer in the water conducting fracture zone after miningwater inrush coefficient method
万方数据
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