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Water-bearing layer segmented grouting curtain water-holding mining method

A technique of grouting curtain and segmental grouting, which is applied in ground mining, earth square drilling, underground mining, etc.

Active Publication Date: 2019-08-23
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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  • Water-bearing layer segmented grouting curtain water-holding mining method
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  • Water-bearing layer segmented grouting curtain water-holding mining method

Examples

Experimental program
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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 a water-bearing layer segmented grouting curtain water-holding mining method. A water-bearing layer and a coal seam are included. The method includes the steps that a, basic geological parameters are acquired, mining engineering design is carried out, and the direction of underground flow and the position and the size of a first mining area grouting curtain are determined;b, the first mining area grouting curtain is prefabricated in the water-bearing layer above a first protective coal pillar in the flow upstream direction, and then a first mining area is normally stoped until the first mining area is stoped; c, a second mining area grouting curtain is prefabricated in the water-bearing layer, and then a second mining area is stoped; d, the first mining area grouting curtain is removed by recovering the first protective coal pillar or mining the second mining area; and e, a second protective coal pillar 2b and the second mining area grouting curtain 2w are treated according to the working manners of the steps b, c and d, and the rest can be done in the same manner until the whole coal seam is completely mined. Water-holding coal mining is achieved by establishing the curtains, the grouting curtains are automatically removed, and the situation that the curtains cut off supply conditions for a long time, so that the earth surface ecology changes is avoided.

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 Applications(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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