Underground draining and grouting process in thin bedrock and thick loose sand layer rich water areas

A technology of thick loose and thin bedrock, applied in drainage, wellbore lining, underground chamber, etc., to avoid loss, save cost, and improve recovery rate

Active Publication Date: 2013-02-13
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the purpose of the present invention is to solve the problem of safe mining of coal seams in the water-rich area of ​​thin bedrock, thick...

Method used

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  • Underground draining and grouting process in thin bedrock and thick loose sand layer rich water areas
  • Underground draining and grouting process in thin bedrock and thick loose sand layer rich water areas

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] For the water-rich area with thin bedrock and thick loose sand, in order to ensure the safe mining of the coal seam below this area, it is proposed to carry out grouting consolidation on the loose sand layer with strong fluidity, so that the loose sand layer is consolidated into Overall, increase the thickness of the roof, and loosen the sand layer for poor connectivity to consolidate it into blocks, reducing the amount of water gushing sand in the roof caving zone during mining at the working face. The specific process is as follows:

[0030] The first step is to carry out tunneling construction: construct tunneling in the coal seam below this area to provide a working place for underground grouting. Preferably, the exploration lanes are arranged according to the following principles: (1) The angle between the exploration lanes and the working face is 15-30 ...

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Abstract

The invention relates to an underground draining and grouting process in thin bedrock and thick loose sand layer rich water areas. The underground draining and grouting process includes constructing a first drill hole, installing an orifice pipe, grouting, constructing a second drill hole, installing a deep-hole grouting pipe, draining, installing a shallow-hole grouting pipe and sequentially performing shallow-hole grouting and deep-hole grouting in an exploration entry. By aid of solidifying and grouting for a loose sand layer, the loose sand layer can form a cemented whole body and a block or wrappage, when a working surface extracts to be below a grouting area, the solidified integral loose sand layer can serve as a top plate and the block or wrappage to fill a large-fracture water guide channel formed by top plate bedrock falling, and water bursting and sand collapsing can be prevented. The disposable deep-hole grouting pipe replaces a drilling rod for grouting, and accordingly work efficiency of a drilling machine is improved for several times and drilling rod loss is avoided.

Description

technical field [0001] The invention relates to a coal mining technology, in particular to an underground water-repellent grouting technology for safe mining of a coal seam in a water-rich area with thin bedrock and thick loose sand layers. Background technique [0002] In some places with rich coal reserves, such as Northwest China and Inner Mongolia, coal resources are very rich, but the hydrogeological structure in many areas is complex, and the terrain is relatively undulating. The landform is mainly sand-covered hills, large and small ancient gullies Intersecting with the existing gullies, the groundwater in the gullies supplies the surface water in the form of descending springs, and forms seasonal and perennial rivers with atmospheric precipitation. Under the coverage of thin bedrock, thick loose sand layer and water-rich area, coal mining is difficult. Because the bedrock above the coal seam is thin, and the bedrock above the bedrock is mainly loose sand layer rich i...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21F16/00
Inventor 杨俊哲王振荣宋立兵王智欣宋亚新李雄伟
Owner CHINA SHENHUA ENERGY CO LTD
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