A kind of advancing coal mining method adopting goaf roof support in underground coal mine

Abstract

The invention relates to a support method for a top board in an underground coal mine, belonging to the technical field of mining technology and environment 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 immediate roof 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, anchorbeams and anchor cables during formation of the goaf; adopting an anchor cable group to support the upper roof through the immediate roof of the goaf when the unsupported roof distance of the goaf isless than the initial fracture step pitch range of the upper roof; and determining the model, the length and the inter-row space of the anchor cable group till finishing advancing of a working surface; as the working surface is advanced, keeping a crossheading in the working surface in the goaf in order to form passages for production, ventilation, transport, drainage and safety and till advancing of the working surface is finished. A forward-type coal mining method adopting the top board to support in the goaf of the underground coal mine has features such as no coal column and tunnel; a simple method; and easy operation. Additionally, the top board is controlled not to collapse.

Description

technical field [0001] The invention relates to an advancing coal mining method using goaf roof support in underground coal mines, 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 ce...

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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