Support method for underground goaf roof of coal mine

Abstract

The invention relates to a support method for an underground goaf roof of a coal mine, and belongs to the technical field of mining techniques and environmental protection. The method comprises the following steps: getting the initial caving interval of an immediate roof of an underground working face of the coal mine and the initial fracture length of a main roof, as well as the lithology and the thickness of each of the immediate roof and the main roof; adopting an anchor rod, an anchor beam and an anchor rope to synchronously support the immediate roof of a goaf during the process of forming the goaf according to the initial caving interval of the immediate roof; determining the type and length of each of the anchor beam, the anchor rope and the anchor rod for constituting a support structure, as well as the inter-row spacing among the anchor beam, the anchor rope and the anchor rod; adopting steel beam columns or preformed reinforced concrete beam columns to support the main roof through the immediate roof of the goaf within the range that the unsupported back span of the goaf is less than the initial fracture length of the main roof; determining the type, length and inter-row spacing of the steel beam columns or the preformed reinforced concrete beam columns; and operating till the completion of the propulsion work on the working face. The method has the characteristics of simple method, easiness in operation and capabilities of controlling the roof and avoiding caving.

Description

technical field [0001] The invention belongs to the technical field of mining technology and environmental protection, and in particular relates to a method for supporting the roof of a goaf underground in a coal mine. Background technique [0002] At present, the coal mining methods for preventing the roof (including the direct roof and the old roof) from collapsing in the goaf of the coal mine generally include two mining methods, the filling method and the coal pillar support method, according to the properties and thickness of the roof. [0003] The filling method mainly includes: after a certain distance is advanced with the working face, when the rock formation in the goaf begins to be exposed from the cut hole, the filling material is sent to the goaf to fill the goaf to support the roof and make the roof directly , The old roof does not completely fall; the current filling method solves the problem of reducing the deformation and damage of the roof in the goaf to a c...

AI Technical Summary

Problems solved by technology

[0003] The filling method mainly includes: after a certain distance is advanced with the working face, when the rock formation in the goaf begins to be exposed from the cut hole, the filling material is sent to the goaf to fill the goaf to support the roof and make the roof directly , The old roof does not completely fall; the current filling method solves the problem of reducing the deformation and damage of the roof in the goaf to a certain extent, but the problem of filling in the gob is that the roof may fall while filling, and the filling body and the roof are in close contact. It is difficult to control the degree of control, and the roof will still be damaged and collapsed if it is not properly controlled. Coal mining and filling are carried out at the same time. The two processes interfere with each other and affect normal production.

If the caving coal mining method is used to mine coal resources under the ground buildings, the consequences will lead to the subsidence of the ground above the mine and the destruction of the ground buildings.

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