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Curtain grouting method for large-space large-dip-angle goaf

A technology of curtain grouting and goaf, which is applied in mining equipment, mining equipment, earthwork drilling and mining, etc., can solve the problems that large-space curtain grouting cannot be realized, so as to improve construction efficiency, reduce project cost, and ensure The effect of barrier effect

Active Publication Date: 2021-08-27
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a curtain grouting method for large-space and large-inclination goafs to solve the problem that the existing grouting methods cannot realize curtain grouting plugging in large-space and high-inclination goafs

Method used

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  • Curtain grouting method for large-space large-dip-angle goaf
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  • Curtain grouting method for large-space large-dip-angle goaf

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Embodiment 1

[0038] A specific embodiment of the present invention discloses a curtain grouting method for gobs with large space and large inclination angle, the operation flow is as follows figure 1 As shown, the grouting control principle is as follows figure 2 As shown, the method includes the following steps:

[0039] Set up a water-stop curtain inspection and exploration line between the surface river and the boundary of the mining area, and the water-stop curtain inspection and inspection line passes through the underground space in the mining area to be treated;

[0040] On both sides of the water-stop curtain exploration line, around the exploratory boreholes that expose the void area, the construction feeding boreholes are intensified. The empty area is poured with coarse aggregate quick-setting concrete.

[0041] In this embodiment, the goaf with large space and large inclination angle means that the height of the goaf is greater than or equal to 4m, and the inclination angle ...

Embodiment 2

[0097] Yet another specific embodiment of the present invention discloses a method for curtain grouting in goafs with large space and large inclination, which is improved on the basis of Embodiment 1. Before grouting in the interior, carry out hydrological tracer test, based on the hydrological tracer test, accurately determine the key blocked water passages and estimate the required amount of mud.

[0098] Before grouting in the exploration borehole 7 of the exposed void area, when the proposed grouting water plugging curtain exploration borehole detects an old void or old lane, select one or more in the dense feeding borehole 8 The feeding borehole 8 is used as a temporary hydrological observation hole 9. After the monitoring task is completed, the temporary hydrological observation hole 9 and other feeding boreholes 8 are plugged with feeding grouting, and a permanent hydrological observation hole 10 is constructed outside the encrypted feeding line 5. The depth of the hydrol...

Embodiment 3

[0107] Since the suitable construction time in high-altitude areas is only from April to May each year, the suitable construction time is very short. Traditionally, the existing method of first detection and then treatment is adopted. It is necessary to find all the water passages first, and then build the underground waterproof curtain. It is impossible to complete the exploration and construction of the underground waterproof curtain wall in just two months, and it is difficult to complete the construction of the curtain wall within a suitable construction period.

[0108] Based on the above problems, another specific embodiment of the present invention, on the basis of Embodiment 1 and Embodiment 2, discloses a curtain grouting method for large-space and large-inclination goafs. During the construction of the exploratory drilling on the water-stop curtain inspection and exploration line 4, grouting is carried out in the exploratory drilling 7 of the exposed empty area to for...

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Abstract

The invention relates to a curtain grouting method for a large-space large-dip-angle goaf. The curtain grouting method comprises the following steps: an inspection and treatment exploratory line of a waterproof curtain is arranged between a surface river and a mining area boundary; feeding drill holes are densely constructed around the exploring drill holes of the exposed goaf on the two sides of the exploratory line of the waterproof curtain; and cement-water glass double slurry is poured into the underground goaf through the exploring drill holes of the exposed goaf, and coarse aggregate quick-setting concrete is poured into the underground goaf through the feeding drill holes. The curtain wall is constructed between the surface river and the mining area boundary to effectively isolate the supply of the surface river to the old goaf, and effective treatment of the large-space goaf and the coal and rock layer mining area with the large dip angle is achieved.

Description

technical field [0001] This patent belongs to the technical field of coal mine water disaster control, and specifically relates to a curtain grouting method for gobs with large space and large dip angle. Background technique [0002] The coal seams in the northwest mining area are generally buried shallowly, and some valleys are exposed, so most of the mining areas have a long history of mining, but the lack of planning in the historical mining work and the private excavation of some small coal kilns have led to different degrees of mining of the shallow coal seams, forming Old empty areas of different sizes and shapes. These old mined-out areas located in mountain torrent valleys generally have a certain hydraulic connection with surface water, so that if the old mined-out areas are exposed during coal mining, water inrush will occur, threatening the safety of coal mine production. [0003] Grouting to seal the goaf is the most commonly used method at present. Due to vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F15/00E21F17/00
CPCE21F15/005E21F15/00E21F17/00
Inventor 李小琴李文平祝慧王绪友宁廷洲刘丙方宋传祥
Owner CHINA UNIV OF MINING & TECH
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