Roof water control method based on precracking and grouting modification

Abstract

A roof water control method based on pre-cracking and grouting modification, which includes the following steps: Step 1: Determine the height of the water-conducting fracture zone of the working face; Step 2: Determine the fracturing and grouting before the mining of the working face; Step Step 3: Determine the fracturing and grouting layer; Step 4: Determine the range and thickness of the fracturing and grouting plane; Step 5: Hydraulic fracturing of the horizontal hole in the roof rock layer, and hydraulically fracturing the rock layer through the horizontal branch holes on the construction ground, Fracturing the original continuous medium into a discontinuous medium; Step 6: Grouting the roof stratum to greatly reduce the water-passing capacity of the strata; thus, the present invention fractures the stratum with good continuity into a discontinuous stratum, and then uses injection The slurry technology transforms the rock formation into a relatively weak water-proof protective layer, so as to achieve the dual purpose of inhibiting the upward development of the water-conducting fracture zone and weakening the permeability of the rock formation, thereby reducing the influx of groundwater in the aquifer on the roof of the coal seam into the coal mining work through the water-conducting fracture zone. surface water.

Description

technical field [0001] The present invention relates to the technical field of mine water prevention and protection of underground water resources, and in particular to a pre-cracking and grouting modified roof based on pre-cracking and grouting modified rock formation technology for controlling coal mining face roof water gushing in underground coal mines Water Control Methods. Background technique [0002] The loose porous aquifer near the surface of the Ordos coalfield with good water-rich properties is an aquifer with important ecological value. As the mining fractures formed by coal seam mining develop into the loose layer aquifer near the surface, groundwater enters the coal mining face along the mining fractures. , generally form a serious roof water damage problem. For the prevention and control of roof water damage, the traditional method is to pre-drain and reduce the groundwater in the aquifer by drilling, or to suppress the height of the water-conducting fissure...

AI Technical Summary

Problems solved by technology

However, the method of pre-draining and dredging the groundwater in the aquifer by drilling engineering will not reduce the drainage of the working face in the whole process of pre-mining, mining and post-mining, and the high-strength drainage of groundwater in the aquifer will not only increase the mining capacity of the mine. At the same time, groundwater resources are greatly wasted, which leads to a series of ecological and environmental problems such as groundwater level drop, surface water pollution, land salinization, etc.

However, the method of restricting the height of coal seam mining and strip mining to suppress the height of water-conducting fissures has the problem of a large waste of coal resources.

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