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Ultra-thick coal seam fully-mechanized caving filling mining method based on underground gangue heap

A technology of extra-thick coal seam and mining method, applied in the fields of backfill, underground mining, special mining, etc., can solve the problems of top coal caving and goaf filling, etc., so as to improve the recovery rate, save ground space, and improve coal mining. The effect of gangue pollution

Active Publication Date: 2021-10-29
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of partial filling in the goaf and caving of top coal in the fully mechanized caving mining of deep extra-thick coal seams, the present invention provides a method of fully mechanized caving and filling mining of extra-thick coal seams based on underground gangue piles

Method used

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  • Ultra-thick coal seam fully-mechanized caving filling mining method based on underground gangue heap
  • Ultra-thick coal seam fully-mechanized caving filling mining method based on underground gangue heap
  • Ultra-thick coal seam fully-mechanized caving filling mining method based on underground gangue heap

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Embodiment 1

[0040] This embodiment provides a fully mechanized caving and filling mining method for extra-thick coal seams based on gangue piles underground, which specifically includes the following steps:

[0041] 1. Collect relevant data, according to the distribution of the overlying strata in the mine, the thickness of the coal seam, and the geological structure, the direct roof is a hard rock stratum. The length of the arranged working face is 150-200m, and the continuous advancing length of the mine working face is 1000-2000m. According to the layout of the working face and the properties of the overlying roof, the fracture form of the roof is predicted. When the length b of the working face and the advancing distance a satisfy a / b image 3 The broken form shown in (1).

[0042] 2. When arranging the coal mining face 7, based on the roof slab failure theory combined with the layout of the working face to predict the roof failure mode and the stress concentration area of ​​the roof, i...

Embodiment 2

[0049] This embodiment provides a fully mechanized caving and filling mining method for extra-thick coal seams based on gangue piles underground, which specifically includes the following steps:

[0050] 1. Collect relevant data, according to the distribution of the overlying strata in the mine, the thickness of the coal seam, and the geological structure, the direct roof is a hard rock stratum. The length of the arranged working face is 150-200m, and the continuous advancing length of the mine working face is 1000-2000m. According to the layout of the working face and the properties of the overlying roof, the fracture form of the roof is predicted. When the length b of the working face and the advancing distance a satisfy a / b=1, basically breaking of the top image 3 (2) shows the broken form.

[0051] 2. When arranging the coal mining face 7, based on the roof failure theory combined with the layout of the working face to predict the failure mode of the roof and the stress ...

Embodiment 3

[0057] According to the layout of the working face and the properties of the overlying roof, the fracture form of the roof is predicted. When the length b of the working face and the advancing distance a satisfy a / b=1, the fracture of the basic roof is image 3 (3) The broken form shown. The steps in this embodiment are the same as those in Embodiment 2, and will not be repeated here.

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Abstract

The invention discloses an extra-thick coal seam fully-mechanized caving filling mining method based on an underground gangue geap. A coal-gangue sorting mechanism and a gangue storage bin are additionally arranged underground; one or two filling roadways parallel to a coal seam to be mined are arranged on top coal, the roadways take a hard rock stratum as a roof and a coal seam as a floor, and the roof is supported by adopting prestressed deformed steel bar resin anchor rods; a metal net parallel to the floor is laid in each roadway, and a stretchable belt conveyor is arranged on the metal net along one side of the roadway; and coal mined from a working face is subjected to underground separation, gangue is conveyed to the filling roadways, and one or two filling belts which take the gangue heap as the unit to support a fracture space stress concentration area are formed in a goaf along with advancing of the working face. According to the method, underground mining and filling machinery integrated parallel operation is achieved for the first time, gangue underground self-supply is realized, under the condition that the corresponding surface subsidence requirements are met, overlying strata can be effectively prevented from collapsing, surface subsidence is restrained, the production structure can be optimized, the cost is saved, and the working efficiency is greatly improved.

Description

technical field [0001] The invention relates to a fully mechanized caving and filling mining method for an extra-thick coal seam based on an underground gangue pile, and belongs to the technical field of coal filling and mining. Background technique [0002] Coal mining under buildings, railways, and water bodies is called "three-down" coal mining. "Three-down" extra-thick coal seams are widely distributed in my country. Layer mining, strip mining, and top-coal caving mining are commonly used in ultra-thick coal seam mining. According to the method, the surface subsidence caused by the natural collapse of the goaf after coal mining will inevitably affect the ground buildings and facilities, and the groundwater level will drop. In order to solve such problems, partial mining method and filling mining method are often used, and the partial mining method needs to reserve coal pillars to support the overlying roof like the strip mining method, and the coal recovery rate is low. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18E21F15/06
CPCE21C41/18E21F15/06Y02W30/91
Inventor 郭星辰郭军冯国瑞郑文贤钱瑞鹏文晓泽朱林俊戚庭野白锦文韩艳娜杜献杰
Owner TAIYUAN UNIV OF TECH
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