Roof water control method based on presplitting and grouting modification

Abstract

The invention relates to a roof water control method based on presplitting and grouting modification. The roof water control method includes the following steps that first, the height of a water diversion fissure zone on the working surface is determined; second, fracturing and grouting are carried out before determining extraction of the working surface; third, fracturing horizon and grouting horizon are determined; fourth, the fracture and grouting plane range and thickness are determined; fifth, horizontal holes of a roof stratum are subjected to hydraulic fracturing, hydraulic fracturing is carried out on the rock stratum through horizontal branch holes of the construction ground, and an original continuous medium is fractured into a discontinuous medium; and sixth, roof stratum grouting is conducted, and the water-passing capacity of the rock stratum is greatly reduced. Thereby, the roof water control method fractures the rock stratum with good continuity into a discontinuity rockstratum, then a grouting technology is adopted to transform the rock stratum into a relatively weak waterproof protective layer to achieve the dual purposes of inhibiting upward development of the water diversion fissure zone and weakening the permeability of the rock stratum, and thus the water yield of aquifer underground water of a coal roof pouring into the coal face through the water diversion fissure zone is decreased.

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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