Water disaster prevention and treatment method for promoting fracture closing through explosion loosening of boundary coal pillars/bodies

Abstract

The invention discloses a water disaster prevention and treatment method for promoting fracture closing through explosion loosening of boundary coal pillars/bodies. On the basis of the growth characteristics of the mining covered rock water-flowing fracture zone height under the specific mining condition, by collecting surface drilling columnar data of coal mining zones, positions of key strata in covered rock are determined by adopting a key stratum position discrimination method, then, on the basis of a covered rock water-flowing fracture zone height prediction method, each zone water-flowing fracture zone growth height and distribution zones, communicated with water-bearing strata, of water-flowing fracture zones are determined, finally, boundary coal pillar/body construction blasting drilling is performed in the goaf direction in a roadway nearby the zone, communicated with the water-baring strata, of the water-flowing fracture zone, and explosion loosening is performed so as to promote a covered rock stratum to be subjected to advanced fracturing; accordingly, original boundary open fractures are closed step by step, the fracture opening degree is decreased, and the water-flowing capacity is lowered.

Description

technical field [0001] The invention relates to a method for preventing and controlling roof water hazards, in particular to a method for preventing and controlling water hazards that is applicable to the technical fields of coal mining water resource protection and mine water hazard prevention and control. Background technique [0002] Underground coal mining will cause the movement and destruction of the overlying strata, thereby forming mining cracks in the overlying rock. The mining cracks in the overlying rock not only provide a channel for the loss of regional water resources, but also become the geological source of underground water damage. When there are one or more layers of aquifers with strong water-richness in the coal-measure strata, the water in the aquifers damaged by mining will rush to the underground goaf along the water-conducting fissure channels, and connect the fissures in the aquifers. The more channels and the stronger the water-richness of the aquif...

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Problems solved by technology

However, the above-mentioned methods all have certain limitations. The first method will no longer be applicable under the mining conditions where there are many aquifers in the formation, high water-richness, and strong water recharge capacity in the aquifer. Simply relying on drilling and dredging cannot achieve water cut reduction. However, the second type of method is difficult to apply when the coal seam is thick and the aquifer is close to the coal seam. Even if the mining height is small, the water-conducting fracture zone will still communicate with the aquifer.

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