Curtain grouting method for shallow buried nearly horizontal burnt rock water-bearing layer

A technology of curtain grouting and burial, which is applied in earthwork drilling, wellbore lining, tunnel lining, etc. It can solve the problems of high drilling cost, large drilling engineering volume, continuous drilling of drilling holes, etc., and achieve the effect of more options

Active Publication Date: 2018-11-16
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology

[0004] The invention provides a curtain grouting method for shallowly buried near-horizontal burnt rock aquifers, which solves the problems of large drilling engineering volume, high drilling cost, ina

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  • Curtain grouting method for shallow buried nearly horizontal burnt rock water-bearing layer
  • Curtain grouting method for shallow buried nearly horizontal burnt rock water-bearing layer
  • Curtain grouting method for shallow buried nearly horizontal burnt rock water-bearing layer

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] A coal seam in the northern Shaanxi mining area is a coal seam of the Jurassic Yan'an Formation. The geological structure is simple, and the coal seam dip is small. Main mining seam 4 -2 The average coal thickness is about 3.63m, and the middle part of the minefield is 4 -2 Burnt rocks are in direct contact with the reservoir after coal burning, 4 -2 coal below 5 -2 Coal is a complete coal seam that has not been burned. According to outcrop observations of burnt rocks, 4 -2 The average thickness of the coal-fired metamorphic rock is about 15-20m, and it is highly water-rich due to the water supply of the reservoir. 4 -2 Coal floor distance 5 -2 Coal about 75m, 5 -2 Coal thickness is about 6m, 5 -2 After the coal face is mined, the water-conducting fracture zone will develop to 4 -2 coal burnt rock, 4 -2 Water in burnt rocks in the coal-fired area contrib

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Abstract

The invention belongs to the technical field of mine water prevention and control and particularly relates to a curtain grouting method for a shallow buried nearly horizontal burnt rock water-bearinglayer. The problems that as for existing curtain grouting, the drilling engineering amount is large, the drilling cost is high, drill holes cannot be drilled continuously in burnt rock, effect inspection holes possibly have leakage points, and area occupation of a drilling field is large are solved. The curtain grouting method provided by the invention mainly comprises the following steps that (1)a curtain line is arranged; (2) a row of vertical holes is arranged in the curtain line at equal distances; (3) an orifice closed grouting technology is adopted, and the burnt rock water-bearing layer is grouted according to the drilling sequence; and (4) after all the vertical holes in the curtain line complete drilling and grouting, the 1-N nearly horizontal directional drill holes are arranged, and 1-N layers of horizontal sections of the directional drill holes are arranged. The curtain grouting method has the following advantages that area occupation of the drilling field is small, the drilling engineering amount is small, the drilling engineering cost is low, choices of the drilling field are more, and the effects of curtain inspection and grout supplementing are good.

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Claims

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Application Information

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Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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