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Method for filling mined coal to recover residual coal pillar and controlling stability of waterproof key layer

A coal mining technology with coal pillars and filling, which is applied in the direction of filling, ground mining, mining equipment, etc., can solve the problems of aggravating the ecological fragile environment, soil erosion, damage, etc., and achieve the effect of ensuring long-term stability

Inactive Publication Date: 2018-05-29
CHINA UNIV OF MINING & TECH
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Problems solved by technology

The mining area in this area has been adopting the room-type coal mining method for a long time. This method causes a lot of waste of coal resources, and the mining rate of coal resources is less than 40%.
On the other hand, after the coal seam is mined, due to the long-term effect of the overlying rock, it is easy to cause instability and failure of the coal pillar, and the roof collapses in a large area, resulting in the upper Quaternary Middle Pleistocene Lishi loess and the Tertiary Pliocene three-toed horse The clay water-repellent layer composed of red soil is destroyed, water and soil are lost, and the destruction of the local ecologically fragile environment is aggravated

Method used

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  • Method for filling mined coal to recover residual coal pillar and controlling stability of waterproof key layer
  • Method for filling mined coal to recover residual coal pillar and controlling stability of waterproof key layer
  • Method for filling mined coal to recover residual coal pillar and controlling stability of waterproof key layer

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specific Embodiment approach

[0048] A western mine originally adopted the short-wall strip room mining method, resulting in a large number of coal pillars left underground, resulting in a large waste of coal resources. In recent years, it has been found that some coal pillars are unstable and spontaneously combustible, which in turn leads to large-scale subsidence on the surface, seriously affecting the local ecological environment. In order to solve the above-mentioned problems, in combination with the content of the invention of this patent, the specific implementation methods for the recovery of the remaining coal pillars in the first mining face are as follows:

[0049] (1) Aiming at the mined area of ​​the first mining working face in a panel area, along the direction perpendicular to the main road, arrange a mining working face for every two adjacent columns of coal pillars, the mining height of the working face is 4.5m, and the working face is 800m in length , the inclination length is 70m, and a s...

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Abstract

The invention discloses a method for filling mined coal to recover residual coal pillar and controlling the stability of a waterproof key layer. Glue filling and pumping devices are arranged in a tunnel formed by a coal-mined chamber, goafs on the two sides are filled with glue filling materials with aeolian sand as the main part, and the residual coal pillar is recovered after a to-be-filled bodyreaches certain bearing capacity; after the coal pillar is recovered, the goafs are filled with aeolian sand secondarily through a high-speed power throwing machine and a bulldozer. By means of the method, the earth surface natural aeolian sand material can be used to the maximum extent, the overlying waterproof key layer is effectively controlled, and a new technological method is provided for recovering the residual coal pillar in the ecological weak mine area in western China and protecting the ecological environment.

Description

technical field [0001] The invention relates to the field of backfill coal mining and recovery of leftover coal pillars, and in particular to a method for backfill coal mining recovery of leftover coal pillars and controlling the stability of water-proof key layers. Background technique [0002] With the high-intensity mining of coal resources in China and the gradual depletion of coal resources in the eastern mining areas, the western mining areas of my country have become the main body of coal resource mining. In recent years, the large-scale coal bases that the state has focused on are mainly concentrated in Shanxi, Shanxi, Mongolia, Ningxia, and Gansu, where the ecological environment is very fragile and soil erosion is serious. The mining area in this area has been adopting the room type coal mining method for a long time, which causes a lot of waste of coal resources, and the mining rate of coal resources is less than 40%. On the other hand, after the coal seam is min...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F15/00E21C41/18
CPCE21C41/18E21F15/00
Inventor 张吉雄孙强周楠张强姜淑印
Owner CHINA UNIV OF MINING & TECH
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