Non-coal-pillar mining method for roof caving roadway forming along goaf by crushing immediate roof

A coal pillar-free, direct technology, applied in ground mining, mining equipment, mining equipment, etc., can solve problems such as difficult roadway formation, and achieve the effect of easy promotion and simple process

Active Publication Date: 2018-10-12
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the direct roof is broken and difficult to form a roadway, the present invention provides a coal pillar-free mining method for the broken direct roof and caving the roof along the space to form a roadway

Method used

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  • Non-coal-pillar mining method for roof caving roadway forming along goaf by crushing immediate roof
  • Non-coal-pillar mining method for roof caving roadway forming along goaf by crushing immediate roof
  • Non-coal-pillar mining method for roof caving roadway forming along goaf by crushing immediate roof

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Embodiment Construction

[0022] Take a certain coal mine as an example to further illustrate the technical scheme of the present invention.

[0023] The coal seam mined in a certain coal mine is the second mining area of ​​the third seam, the thickness of the third seam is 1.1m, most areas of the coal seam develop mudstone false roof, the thickness is about 0.3m, the direct roof is 3.5m of silty mudstone, and the direct roof density ρ =2.5t / m 3 ; Fissures are developed in the immediate roof. According to the mining situation in the first mining area, it is found that the immediate roof pops up with mining, which belongs to the situation of broken direct roof. The old top is gray-white fine sandstone and medium-fine sandstone, with a thickness of 1.5-9.0m and an average of 4.5m. The above-mentioned coal seam has adopted the mining method without coal pillars of the present invention by caving the roof along the gob and forming roadway:

[0024] Step one, such as figure 1 As shown, firstly, excavate ...

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Abstract

The invention discloses a non-coal-pillar mining method for roof caving roadway forming along a goaf by crushing an immediate roof. The non-coal-pillar mining method comprises the following steps thatwhen a mining roadway of a first coal mining working face is driven, and the top of the mining roadway is subjected to ceiling support while driving is conducted; and then a roof cutting anchor cableis constructed along the coal wall of the first coal mining working face, and an I-shaped steel beam is mounted on the anchor cable, so that the immediate roof after being stoped out breaks off and falls down along the roof cutting I-shaped steel beam into a loose wall formed by naturally stacking caved broken stone so as to finally support an upper roof, thus the upper roof still keeps the action of a rock beam, the roadway after coal mining is conducted is directly top-hung to be hung on the rock beam and is not caved, and a remained gateway along the goaf is formed. According to the non-coal-pillar mining method, by utilizing the mine ground pressure and the characteristics of low strength and weak completeness of the immediate roof, after the working face is pushed, an immediate roofrock layer is caved and accumulated at the edge of the goaf to form a pack wall and a closed goaf, an artificial roadway side is not needed, the technology is simple, and thus the non-coal-pillar mining technique is easy to popularize.

Description

technical field [0001] The invention belongs to coal mine mining technology, in particular to coal pillar-free mining technology. Background technique [0002] The traditional coal pillar mining method wastes a lot of coal resources, and accumulates a large amount of compressive elastic energy on the coal pillar, which is easy to cause dynamic disasters such as rock burst, coal and gas outburst. For this reason, a new technology of coal pillar-free mining has been proposed in recent years. Coal pillarless mining has very significant direct value effects such as reducing the loss of coal resources, high yield and high efficiency, improving the investment efficiency of underground workers, and prolonging the life of mine mining. At present, the most representative coal pillar-free mining technology is to artificially build a wall on one side of the goaf to support the roof, which is called an artificial roadside. The construction methods of artificial sideways mainly include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16E21D20/00E21D11/15E21D11/14E21F17/12
CPCE21C41/16E21D11/14E21D11/152E21D20/00E21F17/12
Inventor 郝建石永奎王新徐明伟赵增辉陈军
Owner SHANDONG UNIV OF SCI & TECH
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