Water retention method for promoting self-healing of mining fractures by chemically softening carbonatite

摘要

#$%^&*AU2018418035A120191128.pdf#####Abstract The present invention discloses a water retention method for promoting self-healing of mining fractures by chemically softening carbonatite, which is suitable for the technical fields of water resource protection and mine water hazard prevention and treatment in coal mining. Information of the distribution range of a water-conducting fractured zone in overlying strata that communicates with a water-bearing layer in stratum and information of a rock stratum with rich carbonatite mineral in a mining area are determined; in the mining area, a drill hole is constructed from the ground surface to a target rock stratum with rich carbonatite mineral within the range of the water-conducting fractured zone and below the water-bearing layer in stratum, a softener is injected to the fractures in the target rock stratum through the drill hole, to fully react with the carbonatite mineral in the target rock stratum to soften the carbonatite, so as to drive the tension fractures in the rock mass to close gradually under the action of the stress in the mining stratum, to decrease the water conducting ability of the tension fractures, and thereby to artificially promote self-healing of the mining fractures and realize protection of the underground water-bearing layer. The method has simple steps, can attain a reliable effect, and is highly practical. 1