Rock cross-cut coal uncovering section coal body dust reduction and reinforcement structure and construction method thereof

Abstract

The invention belongs to the technical field of coalmine production and construction, and particularly relates to a rock cross-cut coal uncovering section coal body dust reduction and reinforcement structure and a construction method thereof. The rock cross-cut coal uncovering section coal body dust reduction and reinforcement structure comprises a reinforcement layer arranged on the surface of a coal body and a plurality of water injection holes penetrating the interior of the coal body; the reinforcement layer is formed by cement spraying; the water injection holes are radially distributed in the direction from the surface of the coal body to the interior of the coal body; in the water injection stage, a dilatation water injector is arranged in each water injection hole; after completion of water injection, the water injection holes are filled with concrete, and steel wire ropes are pre-buried in the concrete. According to the rock cross-cut coal uncovering section coal body dust reduction and reinforcement structure and the construction method thereof, the water injection holes are radially distributed, in the water injection stage, as the sealing depth is great, greater water injection pressure can be applied, water can fully diffuse to moisture the coal body so as to achieve the dust reduction effect; besides, in the reinforcement stage, concrete columns in the water injection holes can wrap the coal body, so that the reinforcement effect is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of coal mine production and construction, and in particular relates to a coal body dust-reducing reinforcement structure and a construction method of a Shimen unraveling coal section. Background technique [0002] With the extension of mine mining to the deep, coal mining at Shimen has always been the key point of coal mine safety management. Coal mining at large cross-sections, roofs and free surfaces of coal-passing sections are prone to chipping and leaking roofs, causing gas to exceed the limit, and even coal and gas outbursts Or major accidents such as gas explosions. Before the coal was uncovered in Shimen, regional outburst reduction measures were taken for the coal body in the exposed coal section by drilling and drainage. After the drilling and extraction, the coal body was loose and dry, and the internal friction angle and cohesion between the coal bodies were reduced, which was prone to shear fail...

AI Technical Summary

Problems solved by technology

Before the coal was uncovered in Shimen, regional outburst reduction measures were taken for the coal body in the exposed coal section by drilling and drainage. After the drilling and extraction, the coal body was loose and dry, and the internal friction angle and cohesion between the coal bodies were reduced, which was prone to shear failure, resulting in During the unraveling of coal, the dust is large and easy to leak

Traditionally, shallow hole low-pressure water injection is carried out on the coal body, and the water injection effect is limited due to the poor permeability of the coal body itself.

Traditionally, the free surface is reinforced by anchoring, hanging nets, and spraying grout. The exposed anchors after the blasting affect the construction, and the sawing affects the next process. The traditional method not only wastes costs, but also has cumbersome procedures, and the coal body itself is not obtained. Reinforcement, after blasting, free surface reinforcement gap easy piece help

At present, there is no active coal dust reduction and reinforcement construction technology with good effect at home and abroad.

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