WATER RETENTION METHOD FOR PROMOTING SELF-HEALING OF MINING FRACTURES BY CHEMICALLY SOFTENING CARBONATITE

摘要

The present invention discloses a water retention method for promoting self-healing of miningfractures by chemically softening carbonatite, which is suitable for thetechnical fields of waterresource protection and mine water hazard prevention and treatment in coalmining. Informationof the distribution range of a water-conducting fractured zone in overlyingstrata thatcommunicates with a water-bearing layer in stratum and information of a rockstratum with richcarbonatite mineral in a mining area are determined; in the mining area, adrill hole is constructedfrom the ground surface to a target rock stratum with rich carbonatite mineralwithin the range ofthe water-conducting fractured zone and below the water-bearing layer instratum, a softener isinjected to the fractures in the target rock stratum through the drill hole,to fully react with thecarbonatite mineral in the target rock stratum to soften the carbonatite, soas to drive the tensionfractures in the rock mass to close gradually under the action of the stressin the mining stratum,to decrease the water conducting ability of the tension fractures, and therebyto artificially promoteself-healing of the mining fractures and realize protection of the undergroundwater-bearing layer.The method has simple steps, can attain a reliable effect, and is highlypractical.