Steep-coal-seam long wall face non-pillar coal mining method

A mining method and working face technology, applied in ground mining, mining equipment, earth drilling and mining, etc., can solve the problems of wasting coal resources, easily crushed along the goaf roadway, and unable to recover

Active Publication Date: 2013-07-10
CHINA UNIV OF MINING & TECH (BEIJING)
View PDF7 Cites 44 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot well solve and realize the coal pillar-free mining under the condition of a hard roof in the longwall working face of a high-inclination coal seam, because:
[0003] If coal pillars are used to maintain the gob-side roadway, if the coal pillars are too small, the coal pillars will not be able to support the pressure of the stope roof, and will not be able to protect the gob-side roadway. A

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Steep-coal-seam long wall face non-pillar coal mining method
  • Steep-coal-seam long wall face non-pillar coal mining method
  • Steep-coal-seam long wall face non-pillar coal mining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0056] The coal seam inclination angle of the working face is 32-35 degrees, the working face is inclined to be 216 meters long, the strike is 650 meters long, and the buried depth is 600 meters. It belongs to the coal of the Carboniferous Permian Xuanwei Formation. The sandy mudstone is composed of fine sandstone with a thickness of 2 to 5 meters on the immediate upper part. It is mined by long-wall retreating comprehensive mechanization, and the roof is managed by the caving method. Among them, the machine lane is 650 meters long and has a special-shaped section. The lane is 2.5 meters high and 3.6 meters wide. During the test period, the working face was mined 600 meters, and after experiencing multiple occurrences of mine pressure, a total of 550 meters of roadway was formed. 3.5 meters, and according to field observations, gangue cut from the side of the roadway is full of gangue and the roof is connected to the roof within 60 meters after mining. On the outside of the s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a steel-coal-seam long wall face non-pillar coal mining method. The method comprises the steps of (1) excavating an upper crossheading roadway and a lower crosshead roadway; (2) mounting a constant-resistance large-deformation anchor rod, processing a row of vertical energy-gathering blasting holes, and implementing blasting and presplitting; (3) erecting a column body for supporting a top plate, and arranging a protective layer on the back of the column body; and (4) carrying out recovery, slipping the top plate of a recovery face along a presplitting kerf; (5) withdrawing the column, hanging a net and spraying concrete to form a support layer; (6) mounting a slip-casting constant-resistance long anchor rod, and grouting; (7) forming a roadway automatically in the original crosshead roadway and taking the roadway as the upper crosshead roadway of the next mining face; and (8) repeating the steps (2)-(7). According to the method, the top plate at a worked out section collapses along the presplitting kerf, and meanwhile, a lower crosshead top plate is prevented from being damaged, and small caving waste rocks are prevented from entering the lower crosshead roadway, so that the roadway is automatically formed in the original crosshead roadway.

Description

technical field [0001] The invention relates to a coal seam mining method, in particular to the coal seam mining method of a longwall working face under the condition of a hard roof with a coal seam inclination exceeding 30°. Background technique [0002] In order to improve the advancing speed and high-efficiency production, the fully mechanized mining of high-inclination coal seams has been popularized and applied in my country, and has achieved good economic and technical benefits. However, the gobside roadway maintenance technology corresponding to high-inclination coal seams is seriously lagging behind. At present, the working face of high-inclination coal seam mainly adopts the method of masonry gangue wall next to the roadway to maintain the gob-side roadway for retaining roadway and coal pillar mining. Due to the increase of the inclination angle of the coal seam, after the coal seam is mined, the roof of the stope also has a law of mine pressure that is different fr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): E21C41/16E21D20/02E21F15/02
Inventor 何满潮孙晓明杨晓杰张国锋赵术江李东发
Owner CHINA UNIV OF MINING & TECH (BEIJING)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap