A kind of mining method of segmental grouting curtain water conservation in aquifer

A grouting curtain, water-retaining mining technology, used in surface mining, earth-moving drilling, underground mining and other directions

Active Publication Date: 2020-06-02
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of aquifer subsection grouting curtain water conservation mining method, to solve the problem how to realize water conservation mining on the basis of high recovery rate of coal resources and high production efficiency proposed in the above-mentioned background technology

Method used

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  • A kind of mining method of segmental grouting curtain water conservation in aquifer
  • A kind of mining method of segmental grouting curtain water conservation in aquifer
  • A kind of mining method of segmental grouting curtain water conservation in aquifer

Examples

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Effect test

Embodiment 1

[0071] as attached figure 1 and 2 As shown, the advancing length of the working face of a certain mine is n=1800m, the length of the working face is m=150m, and the thickness of the mineable coal seam is M=10m. Such as figure 2 As shown, the distance between the roof of the working face and the aquifer is H=160m, the thickness of the aquifer is h=10m, and the water pressure q=1MPa. The width of the protection coal pillar is W=60m, and the rock formation movement angle δ=70°.

[0072] Step 1: Arrange the grouting curtain 11w of the first working face of the first mining area on the side of the aquifer 4 away from the edge of the mining area. The grouting material is cement-water glass slurry, the water-cement ratio of cement is 0.8:1, and the water The Baume degree of the glass is 40°Bé, water glass: cement = 1:1, and the shear strength of the curtain is τ = 0.6MPa. curtain length The 1t distance from the stop production line of the first mining area is L≥Hcotδ=61.9m, an...

Embodiment 2

[0077] as attached figure 1 and 3 As shown, the advancing length of the working face of a certain mine is n=900m, the length of the working face is m=150m, and the thickness of the mineable coal seam is M=1m. Such as figure 1 As shown, the distance between the roof of the working face and the aquifer is H=100m, the thickness of the aquifer is h=5m, and the water pressure q=0.5MPa. The width of the coal pillar is W=60m, and the rock formation movement angle δ=70°.

[0078] Step 1: Arrange the grouting curtain 11w of the first working face of the first mining area on the side of the aquifer 4 away from the edge of the mining area. The grouting material is cement-water glass slurry, the water-cement ratio of cement is 0.8:1, and the water The Baume degree of the glass is 40°Bé, water glass: cement = 1:1, and the shear strength of the curtain is τ = 0.6MPa. Grouting Curtain Length The 1t distance from the stop production line of the first mining area is L≥Hcotδ=36.4m, and th...

Embodiment 3

[0084] as attached figure 1 and 4 As shown, the advancing length of the working face of a certain mine is n=1350m, the length of the working face is m=200m, and the thickness of the mineable coal seam is M=6m. Such as figure 1 As shown, the distance between the roof of the working face and the aquifer is H=30m, the thickness of the aquifer is h=9m, and the water pressure q=0.1MPa. The width of the protection coal pillar is W=60m, and the rock formation movement angle δ=70°.

[0085] Step 1: Arrange the grouting curtain 11w of the first working face of the first mining area on the side of the aquifer 4 away from the edge of the mining area. The grouting material is cement-water glass slurry, the water-cement ratio of cement is 0.8:1, and the water The Baume degree of the glass is 40°Bé, water glass: cement = 1:1, and the shear strength of the curtain is τ = 0.6MPa. Grouting Curtain Length The 1t distance from the stop production line of the first mining area is L≥Hcotδ=10...

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Abstract

The invention discloses an aquifer segmental grouting curtain water-retaining mining method, including an aquifer and a coal seam; a. Obtaining basic geological parameters and carrying out mining engineering design, determining the direction of underground water flow and the position of the grouting curtain in the first mining area and size; b. Prefabricate the grouting curtain of the first mining area in the aquifer above the first protective coal pillar in the upstream direction of the water flow, and then carry out normal mining of the first mining area until the mining is completed; c. Prefabricate in the aquifer The second mining area grouting curtain, then to the completion of mining; d, by reclaiming the first protection coal pillar or mining with the second mining area to realize the elimination of the first mining area grouting curtain; e, according to steps b, c, d The working mode handles the second protective coal pillar 2b and the second mining area grouting curtain 2w, and so on until the entire coal seam is fully mined. The invention realizes water-retaining coal mining by building a curtain; and automatically eliminates the grouting curtain, preventing the curtain from cutting off the supply condition for a long time and affecting the change of the surface ecology.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to an aquifer segmental grouting curtain water-retaining mining method. Background technique [0002] Underground coal mining causes the overlying strata to move and deform, and cracks are formed, which may turn the original water-resisting layer into a water-permeable layer, causing the groundwater level to drop or even leak. This problem is particularly prominent in the northwest mining area where coal resources are abundant but water resources are scarce. How to realize the coordination of coal resource exploitation and water resource protection in mining areas has become one of the hotspots concerned by academic circles and business circles, and it is also a major demand for national strategy and harmonious development of society. [0003] The water-retaining coal mining methods that have been proposed and applied are mainly divided into two categories: one is to reduce the developme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 范钢伟张东升凌斌张世忠李其振
Owner CHINA UNIV OF MINING & TECH
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