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Method for preventing top plate from large area collapsing

A large-area, roof technology, applied in ground mining, earthwork drilling, underground mining, etc., can solve problems such as roof impact, and achieve the effect of ensuring smooth progress, avoiding serious consequences, and ensuring mining conditions and production

Active Publication Date: 2009-09-02
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Large-scale collapse of the roof will have adverse consequences and even seriously affect

Method used

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Embodiment Construction

[0015] The embodiment of the present invention is a method for preventing large-area collapse of the roof in a coal mining area.

[0016] Since the direct roof is a composite roof structure, the roof caving is usually a direct roof caving, and the caving position is usually located inward and outward from the entrance of the branch roadway, and the caving layer is from bottom to top. However, when the roof of the old empty area is suspended in a large area and the pressure exceeds its supporting capacity, the roof of the old empty area will collapse in a large area, which will have a great adverse effect. In order to overcome the existing problems, the method for preventing large-area collapse of the roof according to the specific embodiment of the present invention adopts the following steps:

[0017] The protective coal pillars shall not be less than 35m in the main road of the mine. After the mining face is recovered, it shall be masonry and sealed according to the standard...

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Abstract

The invention relates to a method for preventing large-scale collapse of the roof in a coal mining area. 15-20m of pure coal pillars and 18-23m of radial coal pillars are reserved between them; the coal pillars of the protective channel are reserved, and the recovery rate is appropriately reduced depending on the pressure during recovery; small coal pillars of 500-900mm are reserved between the tunnels; 450-550m set up regional isolation coal pillars, the width of the regional isolation coal pillars is not less than 15m; timely seal the entrance of branch lanes, and add wooden pillars at places with large spans. In addition, silt, coal gangue, etc. are used to fill the mined-out area. The invention can prevent large-area collapse of the roof and ensure smooth production.

Description

technical field [0001] The invention relates to a method for preventing large-area collapse of the roof in a coal mining area of ​​a coal mine. Background technique [0002] my country's coal resources are very rich. In the efficient mining of large coal mines, larger and larger goafs appear as mining progresses. When the goaf is overhanging the roof in a large area and the pressure exceeds its supporting capacity, if the protective measures are not appropriate, the roof of the goaf will collapse in a large area, posing a great threat to the mining face. The main reasons for the large-scale collapse of the roof are: [0003] First of all, the coal roof is a composite roof structure composed of mudstone, siltstone, and multi-layer coal lines, and the bedding, joints, fissures and sliding surfaces are developed in the roof. In addition, the roof weakly contains water, and the rock is hydrolyzed seriously, which reduces the strength. Rock collapse along the structural plane ...

Claims

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Application Information

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IPC IPC(8): E21C41/18
Inventor 张喜武任满翊张日晨周爱平
Owner CHNA ENERGY INVESTMENT CORP LTD
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