A Construction Method of Stable Roof-Coal Pillar Structure in Fully Mechanized Caving Gob-side Coal Roadway

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, a method for constructing a stable roof-column in a fully mechanized caving coal roadway along the gob, which is a direct roof to the adjacent goaf side roadway of the working face in front of the fully mechanized caving coal roadway along the gob in thick and extra thick coal seams. Expansion and cracking of the basic roof, cut the thick roof coal, directly cut off the mechanical connection between the solid coal and the overlying thick roof of the goaf, the direct roof and the basic roof, and significantly reduce the rotation instability of the basic roof, etc. The impact on the roof and coal pillars of the adjacent goaf coal road.Background technique[0002]my country has abundant reserves of thick and extra-thick coal seams. Large-scale comprehensive mechanized top coal caving mining method, referred to as "comprehensive caving", is the main mining method for thick and extra-thick coal seams in my count...

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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