Method for treating water disaster in separation layer of mine

Abstract

The invention relates to the technical field of treatment and prevention of the water disaster in a separation layer of a coal mine and provides a method for treating the water disaster in the separation layer of the mine. The method comprises the following steps: forming a sampling hole in the ground surface; sampling various rock layers through the sampling hole to acquire layer information of various key layers; forming a plurality of grouting holes respectively extending to a grouting layer in the advancing direction of a working face in the ground surface, wherein the grouting layer is the key layer below a water-bearing layer and the layer of a target key layer and a weak layer below the target key layer; injecting water into various grouting holes through a high pressure pump; mining the coal in the advancing direction of the working face, judging whether the hydraulic pressure of each grouting hole is reduced at the same time, if so, then injecting premixed pulverized fuel ashinto the corresponding grouting hole through the high pressure pump. The grouting time is judged according to the change of the hydraulic pressure in the preformed grouting hole, the formation of theseparation layer is intervened in advance, and the potential space of the grouting layer originally used for storing underground water is fully filled with pulverized fuel ash slurry.

Description

technical field [0001] The invention relates to the technical field of control and prevention of coal mine detachment water hazards, in particular to a method for controlling mine detachment water hazards. Background technique [0002] Because the mining of the underground coal seam will cause the movement and fracture of the rock layer, and then a separation layer will be formed between some hard key layers and the weak layers below. With the continuous development of the abscission layer, groundwater such as underground loose rock pore water and clastic rock pore fissure water will continue to infiltrate into the abscission layer, and a large amount of groundwater will be stored in the abscission layer, which greatly threatens the safety of coal mines. [0003] At present, the combination of roof grouting plugging and drilling and drainage is usually used to control delaminated water. In this method, the composite material is injected into the roof fracture zone through do...

AI Technical Summary

Problems solved by technology

Because the composite material must be filled in the cracked zone of the roof and the separation layer, not only the filling volume is large, the final setting time is long, and the cost is high, but also the phenomenon of slurry running, stringing and bleeding is prone to occur

In addition, the mutual interference between coal mining and filling is serious, which greatly affects the coal mining efficiency

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