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

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

Example Embodiment

[0019] Example 1. As shown in Figure 1, for the mining of a coal mine in Shanxi's Lu'an mining area, first conduct hydrogeological exploration on the coal-measure rock strata of the specific mine. It is concluded that the water resources in the strata above coal seam 1 are mainly composed of loose bed water and surface water. Water composition (see Table 1).

[0020] Use mechanical analysis and simulation to identify the key layer 2 of the structure. Substituting the relevant rock layer parameters in Table 1 into the key layer theory discriminant for calculation,

[0021] The key layer theory judges the rigidity condition of the key layer of the structure as:

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

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

Example Embodiment

[0031] Example 2. As shown in Figure 2, for mining in a coal mine in Xuzhou, Jiangsu Province, first conduct hydrogeological exploration on the coal-measure strata of the specific mine. The coal seam 1 in this mining area is 350m deep, and 120m below the mining coal seam has a thickness of 150m~250m Ordovician Limestone layer with well-developed fissures is the main aquifer 3, on which is a limestone layer with a thickness of 60m, which has high strength and good integrity. According to the key layer discriminant, it is judged by computer programming that this layer is the structural key layer 2. Discrimination calculation steps It is omitted along with the embodiment. There are collapsed columns 4 in the structural key layer 2 of the mining section, which will cause serious damage to the water-resistant key layer 2 during mining, and enlarge the original water channel, causing serious water inrush accidents from the floor. Therefore, first grouting and plugging the collapse colum...

Example Embodiment

[0032] Embodiment 3: As shown in Fig. 1, for mining in a coal mine in Xinjiang, hydrogeological exploration is first performed on the coal-measure strata of the specific mine. The coal-measure strata in the mining area is the Jurassic Lower Jurassic, with a total thickness of 319m. The mine is located in the southern foot of the Tianshan Mountains. The surface water system is relatively developed. The alluvial layer in the mine field is thin, composed of medium-coarse sandstone and gravel. There is no stable clay water barrier in the middle, and the ability to receive surface water replenishment is strong. The ancient terrain is undulating, and there are many ancient gullies under the loose layer, which become the main runoff channels for groundwater in the minefield. The hydrogeological conditions of this mine field are relatively complicated, and the geological characteristics are different from those of mines in northeast my country, and also from the thin bedrock and thick loo...

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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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