Flooding damage control method for water-diversion fracture main channels of drill-hole-grouting plugged overburden rock

Abstract

The invention discloses a flooding damage control method for water-diversion fracture main channels of drill-hole-grouting plugged overburden rock. The method comprises the steps: collecting surface-drilling columnar data of all coal mining areas according to development characteristics of altitude of water-diversion fractured zones of overburden rock mined under specific mining conditions, determining stratum positions of all key strata in the overburden rock by adopting a key stratum position distinguishing method, then, determining development altitude of a water-diversion fractured zone of each area and areas of distribution of communicating strata and water-bearing strata of each area by an overburden rock water-diversion fractured zone altitude prediction method, finally, laying out the range of distribution of the water-diversion fracture main channels in areas of the communicating water-bearing strata of the water-diversion fractured zones. and determining a grouting drilling type and drilling construction parameters according to borehole tunnel positions, coal bed cover depth and ground drill distribution conditions; after drilling construction is completed, pumping slurry to areas of the water-diversion fracture main channels so as to plug water-diversion fracture channels. The flooding damage control method for the water-diversion fracture main channels of the drill-hole-grouting plugged overburden rock, disclosed by the invention, is determined, can adapt to different mining conditions and can provide a guarantee for water resource protection, flooding damage control and the like of coal mining of mining areas, the use method is reliable, and the practicability is high.

Description

technical field [0001] The invention relates to a roof water disaster prevention method, in particular to a water disaster prevention method suitable for drilling and grouting in the technical field of coal mining water resource protection and mine water disaster prevention and control to block the main channel of water-guiding fissures in overlying rocks. 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 channel...

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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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