A method for retaining false roofs in layers in coal mining face with solid filling

Abstract

The invention discloses a layered false roof retaining method of a solid filled coal face. The method comprises the following steps: (1), reinforcing and supporting a roof plate before retaining a false roof; (2) layering the false roof according to lithology, thickness and inbreak conditions of the false roof; (3) reinforcing the edge region of a first layered false roof; (4) gradually adjusting a bracket to below the first layered false roof, and supporting the first layered false roof; and (5) continuing adjusting the bracket after the work face is stable so as to retain other layered false roofs. In the whole layered false roof retaining process, the filling quality in goaf is guaranteed, and the goaf is filled with the solid. The method disclosed by the invention is simple, safe and reliable, the work face can fast transit to the normal stage of the false roof retaining exploitation from the stage of the false roof mining exploitation; and meanwhile, the recrement content in raw coal is reduced, the recovery ratio of the coal resource is improved; the method provides a practical, efficient and economic technical scheme for the false roof retaining exploitation under similar condition in China.

Description

technical field [0001] The invention relates to a method for retaining a false roof in a coal mine, in particular to a layered coal mining method with a false roof which is suitable for the transitional stage from mining with a false roof to mining with a false roof in a solid filling coal mining face. Background technique [0002] False roof is a soft rock layer between the coal seam and the direct roof, which falls with mining and is unstable in the coal seam. There are a large number of coal mining faces in the process of advancing. Due to the change of coal seam occurrence conditions and the development of false roofs, the mining faces face the problem of mining false roofs and leaving bottom coal. Mining false top and bottom coal will not only reduce the coal recovery rate, affect coal quality, increase the gangue content of raw coal and wear of working face equipment, but also increase the burden of underground transportation and ground washing. [0003] At present, m...

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Problems solved by technology

[0004] Technical problem: The purpose of the present invention is to solve the problems existing in the prior art, and to provide a method for retaining false roofs in layers in solid-filled coal mining faces, so as to solve the problem of thick unstable false roofs encountered in the working face due to changes in geological conditions. The problem caused by this is to realize the safe and rapid transition of the working face from the mining of the false roof to the mining of the false roof.

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