Water Inrush from Coal Seam Floor under High Mining Depth and High Pressure Water Conditions and Solutions
Under the current mining conditions such as large mining depth,high pressure water on the floor,and high ground stress,correctly evaluating the risk of water inrush from the coal seam floor pressure water is the foundation for doing a good job in water prevention and control.Taking a large water mine in Henan Province,which is threatened by water inrush from bottom limestone confined water,as an example,this paper analyzes the issues such as calculation of bottom failure depth,calculation and critical value of water inrush coefficient,vulnerability index method,and the"double layer water level"effect of different hydrogeological units.Analysis shows that under the conditions of large mining depth and high stress mining,the depth of floor failure is larger than the value calculated by existing empirical formulas.Although the water inrush coefficient of some mines is less than the national critical value,water inrush occurred during the mining process,and the vulnerability index method needs to be standardized.In addition,there are spatiotemporal changes in hydrogeological conditions within the mining area,and even phenomena such as"double layer water level"may occur.In view of this,various countermeasures have been proposed,such as establishing a calculation model for the depth of floor failure under conditions of large mining depth and high ground stress mining,determining the critical water inrush coefficient value of the mining area or mine area,standardizing the vulnerability index evaluation method,identifying the spatiotemporal changes of hydrogeological conditions and hydrodynamic parameters of different units,and developing water prevention and control measures that are suitable for the hydrogeological conditions of each unit.
prevention and control of water in coal minesrisk assessment of water inrushlarge mining depthcoal seam floor confined water
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