Construction method for stable top plate-coal pillar structure along empty coal roadway through fully-mechanized caving

Abstract

The invention relates to a construction method for a stable top plate-coal pillar structure along an empty coal roadway through fully-mechanized caving. The stable top plate-coal pillar structure comprises a tensile anchor cable, a circular truncated cone type baffle disc, a Z-shaped locking tray, a special-shaped quadrilateral tray, a groove cap, a mounting rod, an expanding agent and a hole sealing agent, wherein expanding and fracturing boreholes are formed in a top plate, near a non-stoping roadside, of a mining roadway, slits are cut on the two sides of the boreholes, the tensile anchor cable, the expanding gent, the hole sealing agent and the circular truncated cone type baffle disc are installed in the boreholes, thick top coal is cut on the non-stoping roadside, a locking anchor cable and the Z-shaped locking tray are installed after the slits, and after the fracturing boreholes enter a goaf, the tensile stress on the upper side of a base top at the side region of a working face is remarkably increased, the expansion force of the expanding agent enables a basic top to substantially break along the fracturing boreholes, roadway driving along the goaf is carried out on an adjacent side coal body, a coal pillar side shoulder socket stabilizing anchor is installed on the adjacent side coal body, and the roadway top plate and a coal pillar are located under the protection ofa stable structure of a base top cantilever beam, so that the top plate-coal pillar structure along the empty coal roadway through fully-mechanized caving is constructed, and the method has importantand wide application value.

Description

technical field [0001] The invention belongs to the field of mining engineering, and relates to a method for constructing a stable roof-coal pillar of a fully mechanized caving gob-side coal roadway, which is a direct roof for the gob-side roadway of the working face before a fully mechanized gob-side coal caving roadway in thick and extra-thick coal seams. Expansion fracturing of the roof and the basic roof, cutting the thick roof coal, directly cutting off the thick roof coal overlying the solid coal and the goaf, and the mechanical connection between the direct roof and the basic roof, significantly reducing the rotation instability of the basic roof, etc. The impact on the roof and coal pillars of the gob-side coal roadway on the adjacent side. Background technique [0002] my country has abundant reserves of thick and extra-thick coal seams, and the large-scale comprehensive mechanized top-coal caving mining method, referred to as "mechanized caving", is the main mining...

AI Technical Summary

Problems solved by technology

The gob-side coal roadway of fully mechanized caving is in the low stress area, but the structure of the overlying rock is unstable and the overlying rock turns, which leads to large deformation of the roadway and significantly affects production, and the timing of cracking the thick top coal by the traditional blasting fracturing method cannot be solved well. problems, hindering the development of resource-saving and high-yield and high-efficiency fully mechanized caving mining

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