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Coal-mining method for thin bedrock section

A coal mining method and thin bedrock technology, which can be applied in surface mining, underground mining, earthwork drilling, etc., can solve the problems of low resource recovery rate and low production efficiency, and achieve the effect of efficient mining.

Inactive Publication Date: 2012-06-27
CHINA SHENHUA ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this way, because the water-retaining coal pillars are reserved, the resource recovery rate is very low, and the production efficiency is low due to the increase in the number of moving of the working face

Method used

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  • Coal-mining method for thin bedrock section
  • Coal-mining method for thin bedrock section
  • Coal-mining method for thin bedrock section

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Such as figure 1 Shown, a kind of specific embodiment of the present invention is aimed at the coal mining method of thin bedrock section and comprises the following steps:

[0017] In step 101, first, a critical bedrock thickness is determined. In the present invention, adopt following method for determining critical bedrock thickness:

[0018] The thickness of the load layer for coal mining is considered according to the full thickness of the soil layer, and the conditions for satisfying the balance in the vertical direction are:

[0019] ql z + h lj τ≥l k h lj gamma r +l k Hγ s

[0020] In the formula: l k is the control top distance, m; l z is the length of the top beam, in m; q is the supporting strength of the support, in KPa; τ is the shear strength of the bedrock, in KPa; H is the thickness of the covering soil layer, in m; s , γ r are the bulk density of covering soil layer and bedrock layer respectively, unit is KN / m 3 .

[0021] Therefore, the ...

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Abstract

The invention discloses a coal-mining method for a thin bedrock section. The coal-mining method comprises the following steps of: determining a critical thickness of bedrock; mining a coal-mining area of the thin bedrock when the thickness of a top plate of the thin bedrock coal-mining area is bigger than the critical thickness of the bedrock; performing hole-exploration to the top plate of the thin bedrock coal-mining area to check whether water exists in a rock layer of the top plate, exhausting the water when the water exists; enabling primary supporting force of a supporting frame of the thin bedrock coal-mining area to be bigger than 25MPa; and improving the coal-mining advance rate to be higher than the set value. The coal-mining method for the thin bedrock section can ensure the safe, quick and high-efficient coal-mining of the thin bedrock section.

Description

technical field [0001] The invention relates to a coal mining method aimed at thin bedrock sections. Background technique [0002] During coal mining, the upper part of the coal seam is the bedrock layer, and in many cases, the occurrence characteristics of the coal seam are shallow buried depth and thin bedrock. The upper part of the bedrock is a loose layer such as sandy gravel layer or aeolian sand, some of which are thick and loose with high water content, which poses a great threat to the production of the working face. When the thickness of the bedrock becomes thinner, the support load of the stope support will increase significantly, and the mine pressure will appear in the form, and it is likely to eventually cause the roof collapse disaster. [0003] The critical bedrock thickness refers to the minimum thickness of the roof stratum that can be mined safely in the process of coal mining. When mining below this thickness, major roof accidents will occur. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16
Inventor 杨俊哲贺安民宋选民周成军付玉平
Owner CHINA SHENHUA ENERGY CO LTD