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Water-protection coal-mining method using structural key layer as waterproof layer

A technology of water-retaining coal mining and coal mining methods, which is applied in ground mining, mining equipment, earthwork drilling, etc., can solve problems such as inability to eliminate mine water disasters and inability to effectively protect water resources, and achieve roof water damage prevention and wide practicability Effect

Inactive Publication Date: 2007-05-16
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Obviously, the problems of the traditional coal mining method with drainage and pressure reduction as the main water control measures are prominently manifested in two aspects: ① Passive drainage and pressure reduction cannot actively and effectively protect precious water resources
②Traditional drainage and pressure reduction cannot fundamentally eliminate mine water disasters

Method used

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  • Water-protection coal-mining method using structural key layer as waterproof layer
  • Water-protection coal-mining method using structural key layer as waterproof layer
  • Water-protection coal-mining method using structural key layer as waterproof layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one, as shown in Figure 1, for mining in a certain coal mine in Lu'an mining area, Shanxi Province, at first carry out hydrogeological exploration to concrete mine coal-measure strata, draw the water resources in strata above mining coal seam 1 mainly by loose layer water and surface Water composition (see Table 1).

[0020] Distinguish the structural key layer 2 by means of mechanical analysis and simulation. Substituting the relevant stratum parameters in Table 1 into the theoretical discriminant formula of the key layer for calculation,

[0021] The key layer theory determines the stiffness condition of the key layer of the structure as follows:

[0022] q 1 | n+1 1 | n

[0023] Its calculation formula is: q 1 | n = E 1 h 1 3 ...

Embodiment 2

[0031] Embodiment two, as shown in Fig. 2, carry out mining for a certain coal mine in Xuzhou, Jiangsu, carry out hydrogeological prospecting to concrete mine coal-measure strata first, the coal seam 1 of this mining area is buried deep 350m, there is thickness 150m~250m Ordovician in 120m below the mining coal seam The limestone layer, with developed cracks, is the main aquifer 3, and above it is a 60m-thick limestone layer with high strength and good integrity. According to the key layer discriminant formula, it is judged by computer programming that this layer is the structural key layer 2, and the calculation steps of the discriminant Together with the examples, it is omitted. The structural key layer 2 in this mining area has a collapse column 4, which will cause serious damage to the water-resistant key layer 2 during mining, which will expand the original water guide channel and cause a serious water inrush accident on the floor. Therefore, the grouting plugging of the ...

Embodiment 3

[0032] Embodiment 3: As shown in Figure 1, for mining in a certain coal mine in Xinjiang, hydrogeological exploration is first carried out to the coal-measure strata of the specific mine. The coal-measure strata in this mining area are Jurassic and Lower Jurassic, with a total thickness of 319m. The mine is located at the southern foot of the Tianshan Mountains. The surface water system is relatively developed. The alluvial layer in the minefield is thin and composed of medium-coarse sandstone and gravel. There is no stable clay water-resisting layer in the middle, and it has a strong ability to receive surface water supply. The paleo-terrain is undulating, and there are many ancient gullies under the loose layer, which become the main runoff channels of groundwater in the minefield. The hydrogeological conditions of this minefield are relatively complex, and the geological characteristics are different from mines in Northeast my country, and also different from the hydrogeolog...

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Abstract

The water retention coal mining method utilizes a structural key layer being the aquiclude, covering the abilities of hydrogeological exploration, acquiring and modeling the relevant hydrogeological data about the strata, recognizing the structural key layer using mechanics analysis and numerical simulation and choosing the appropriate coal mining method and process parameters through existing conditions. While realizing the protective exploration of water resources, it can prevent water disaster inside the coal mine; Current techniques accumulated in the process of coal mining, like filling, slip casting, can realize reliable protection for structural key layers, based on the conditions of the mining area in selecting mining method, process, support and protective design to realized the final goal of aquiclude coal mining. It can both prevent the damage of water disasters both from the bottom plate and the top plate.

Description

technical field [0001] The invention relates to a water-retaining coal mining method, which uses a structural key layer as a water-resisting layer to carry out coal mine mining under water safety prevention and water environment protection, and is especially suitable for coal mining where there is a key layer between a coal seam and an aquifer. Background technique [0002] For a long time, coal mining has treated mine water as a water hazard, and it has been treated with the main idea of ​​"drainage, prevention and blockage removal", reducing the water level of the roof (or floor) aquifer, and releasing the water content of the roof of the coal seam in the adjacent section. layer water level to eliminate flooding for working face excavation. In the process of coal mining, whether it is the normal water gushing of the mine, the artificial drainage and drainage for the purpose of preventing mine water damage, and the natural drainage of the coal-measure aquifer by the water-c...

Claims

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Application Information

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IPC IPC(8): E21C41/16E21D11/38
Inventor 缪协兴陈荣华白海波浦海
Owner CHINA UNIV OF MINING & TECH
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