Boundary coal shortwall continuously-mining tunnel arrangement and coal pillar preserving methods

A technology for roadway layout and edge coal, which is applied in ground mining, earthwork drilling, underground mining, etc., can solve problems such as increasing the risk of spontaneous ignition of roof coal seams, wasting resources, and complex roadway layout systems.

Inactive Publication Date: 2015-07-22
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

Third, the roadway layout system is complex and the production system is messy, especially the ventilation system
The fourth is to leave a large number of roof support coal pillars. While wasting resources, it increases the risk of large-area movement of the roof and spontaneous combustion of the coal seam.

Method used

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  • Boundary coal shortwall continuously-mining tunnel arrangement and coal pillar preserving methods
  • Boundary coal shortwall continuously-mining tunnel arrangement and coal pillar preserving methods
  • Boundary coal shortwall continuously-mining tunnel arrangement and coal pillar preserving methods

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Embodiment Construction

[0048] combine figure 1 and figure 2 , the roadway layout and coal pillar setting method of short-wall continuous mining of edge coal, in the coal seam with a short spontaneous combustion period, the goaf needs to be closed in time, and the coal seam occurrence conditions are thick bedrock and thin loose layer or thick bedrock and thick loose layer, adopt The block wide coal pillar arrangement method, the steps of the method are as follows:

[0049] Step 1: Leave a wide isolated coal pillar between each block, and the width of the coal pillar is B 1 The range is 10 ~ 15m, where B 1 The specific value of is calculated by the formula (1), the coal pillar can support the overlying strata, and keep stable for a long time, and can effectively isolate the goaf of the previous block;

[0050] Step 2: Determine the length L of the first block according to the initial caving step of the key layer 1 and the number of branch lanes, where L 1 The specific value is calculated by the ...

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Abstract

The invention discloses a boundary coal shortwall continuously-mining tunnel arrangement and coal pillar preserving methods, according to three typical overlying rock structures, three coal pillar arrangement methods are proposed, and the three coal pillar arrangement methods are respectively a block section wide coal pillar arrangement method, a block section narrow coal pillar arrangement method and a block section non coal pillar arrangement method. Compared with the traditional shortwall continuously-mining tunnel technique tunnel arrangement and coal pillar preserving methods, by the boundary coal shortwall continuously-mining tunnel arrangement and coal pillar preserving methods, the coal pillar size is reduced, the recovery rate of resources can be improved, the roof essential security can be realized, roof safety can be effectively controlled, tunnel excavation and maintenance amount can be reduced, and the risk of coal spontaneous combustion can be reduced.

Description

technical field [0001] The invention relates to coal mine roadway layout and coal pillar setting technology, specifically a method for three typical overlying rock structures, namely thin bedrock (≤20m), medium-thick bedrock (20-40m) and thick bedrock (≥40m), Three roadway layouts and coal pillar setting methods are proposed for the short-wall continuous mining technology of edge coal. Background technique [0002] In recent decades, while the output of coal resources has risen, a large amount of scrap coal has been left behind. With the requirements of a conservation-oriented society and the dwindling of coal resources, the recycling of scrap coal is particularly important. In Inner Mongolia, Xinjiang and other places, due to the application of large-scale mechanized equipment, the size of the working face is increasing year by year, and the edge coal is no longer suitable for the current longwall mining technology. Therefore, the edge coal recovery is mainly based on the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 王树立张开智朱光丽姬松涛潘瑞凯
Owner SHANDONG UNIV OF SCI & TECH
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