Evaluation on Water Inrush Danger from Aquifer under Seam Floor and Water Inrush Prevention and Control Countermeasures

According to the geological and hydrological borehole information of L2 limestone aquifer, L7 limestone aquifer and Cambrian limestone aquifer under th e No.6 seam floor in No.8 Mine of Pingdingshan Coal Mining Group, with the analysis on the water table level of the aquifer under No.6 seam floor and the distance bet ween the seam to the aquifer, the water inrush coefficient method was applied to the evaluation on the dangers of the aquifers in L2 and L7 thin limestone as well as in the Cambrian thick limestone and to the dangers divided.In combination with the fault development conditions, the water prevention and control plan of the limestone W ater under the seam floor was designed.Water prevention and control plan with water bumping and water pressure dropping of the aquifer under seam floor, undergroun d strata grouting reinforcement and underground water drainage was set up to set the basis for the mine safety production.