A support method for the roof of goaf in underground coal mine

Abstract

The invention relates to a support method for a top board of a goaf in an underground coal mine, belonging to the technical field of mining and environmental protection. The method comprises the following steps: acquiring an initial caving step pitch of an immediate roof of a working surface, an initial fracture step pitch of an upper roof, lithological characters and thicknesses of the immediateroof and the upper roof in the underground coal mine; according to the initial caving step pitch of the immediate roof, synchronously supporting the immediate roof of a goaf through anchor rods, anchor beams and anchor cables during formation of the goaf; determining models and lengths of support beams, anchor cables and anchor rods which form a support structure and determining inter-row spaces between the support beams, the anchor cables and the anchor rods; adopting anchor cable groups to support the upper roof through the immediate roof of the goaf when the unsupported roof distance of thegoaf is less than the preliminary fracture step pitch range of the upper roof; determining the model, the length and the inter-row spaces of the anchor cable groups till the working surface is finished advancing. The support method for the top board of the goaf in the underground coal mine enjoys features such as simplicity and easy operation. The top board is controlled not to collapse.

Description

technical field [0001] The invention relates to a method for supporting the roof of a goaf underground in a coal mine, and belongs to the technical fields of mining technology and environmental protection. 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 certain extent...

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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