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

A coal mining face and solid filling technology, which is applied in the field of coal mining with layered and false roofs, can solve problems such as thick, unstable and false roofs, and achieve scientific and engineering significant results

Inactive Publication Date: 2016-04-13
CHINA UNIV OF MINING & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

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Embodiment 1

[0035] Embodiment 1, general situation of working face

[0036] A solid filling coal mining face has a strike length of 150m and a dip length of 1198m. The average thickness of coal in the main mining seam 8 is 2.6m, and the average dip angle is 7°; the immediate roof of the coal seam is relatively hard fine-grained sandstone, and the floor is gray-black silty mudstone; The pseudo-roof of sandy mudstone is stabilized and falls with mining; the method of "retaining the roof in layers and gradually increasing it" is adopted in the working face to retain the pseudo-roof.

[0037] The process of "retaining the top layer by layer and increasing gradually" is as follows:

[0038] The first step is to strengthen the support of the roof before retaining the false roof:

[0039] Before leaving the false roof, after the coal cutting of the working face is completed, the entire working face in front of the support is suspended by means of joint support of "bolt a1 + anchor cable 2 + me...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16E21D11/00
CPCE21C41/16E21D11/00
Inventor 周楠武浩张吉雄郭帅朱同功郝德永
Owner CHINA UNIV OF MINING & TECH
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