Filling and reinforcing method for floor roadway cross-layer pressure-relief borehole

A technology for layer penetration and rock roadway, which is applied in the field of floor rock roadway penetration pressure relief drilling, filling and reinforcement, and can solve the problems of restricting safe and efficient mining of a single soft and high outburst coal seam, uneven coal seam stress distribution, and difficulty in coal roadway support. , to achieve the effect of wide practicability, improving coal strength and improving support conditions

Active Publication Date: 2013-09-11
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, the interbedded pressure relief drilling formed after a large amount of coal is discharged further reduces the strength of the coal, resulting in uneven distribution of internal stress in the coal seam. Frequent occurrence of dynamic phenomena and difficulties in coal roadway support seriously restrict the safe and efficient mining of a single soft and high outburst coal seam

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  • Filling and reinforcing method for floor roadway cross-layer pressure-relief borehole

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the embodiment in the accompanying drawings:

[0014] The filling reinforcement method of the floor rock roadway through the layer pressure relief drilling of the present invention: firstly, in the floor rock roadway drilling site, the common drilling is constructed in the coal seam 1 according to the routine, and then the pressure relief and permeability enhancement measures are adopted in the coal seam 1 through the common drilling Part of the coal body is discharged to form the pressure relief borehole 3 through layers. Wrap 2-4 polyurethane sealing bags 7 with adhesive tape at a distance of 5-6m from the orifice 5 of the gas drainage pipe 5 fed into the pressure relief borehole 3, where the polyurethane sealing bag 7 should be separated from the gas drainage The front end of the pipe 5 is not less than 5m; at the same time, the grouting pipe 8 is fixed at the lower part of the gas drainage pip...

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Abstract

The invention discloses a filling and reinforcing method of a floor roadway cross-layer pressure-relief bore hole, and is particularly adaptable to filling and reinforcing the cross-layer pressure-relief bore hole for pre-drainage of coal roadway strip gas in loose high-outburst coal seams. The method includes injecting a gas drainage pipe, a slurry injection pipe and a gas discharge pipe into the pressure-relief bore hole, and draining gas after slurring injecting and hole sealing; when gas draining flow is reduced to 0.5m3 / d, pressurizing and filling material slurry into the pressure-relief bore hole, and allowing the slurry to fill the pressure-relief bore hole and penetrate to surround coal through fracture networks. By the aid of the filling and reinforcing method, a reinforcing area can be formed in the coal, support and protect conditions of the coal roadway are improved, coal gas accidents are controlled effectively, speed of tunneling the coal roadway is increased greatly; the magnitude of two-side deformation of the coal roadway can be reduced to 40-60%, gas flowing-out amount is reduced to 30%, and the speed of tunneling the coal roadway is increased to 50%, and the filling and reinforcing method has excellent market promoting value.

Description

technical field [0001] The invention relates to a method for filling and reinforcing a layer-crossing pressure-relief drilling hole in a floor rock roadway, and is especially suitable for filling and strengthening the layer-crossing pressure-relieving drilling hole of a pre-extraction coal roadway strip gas in a soft high outburst coal seam. Background technique [0002] A single soft and high outburst coal seam has the characteristics of low strength, low permeability, high gas pressure, and high ground stress. Gas drainage is difficult, and various gas disasters are easily induced during the mining process. At present, when the protective layer cannot be mined, domestic coal mining enterprises often use hydraulic punching, hydraulic slotting and other pressure relief and permeability enhancement measures to improve the pre-extraction effect of coal seam gas in the coal roadway strips, thereby eliminating the outstanding danger in the coal roadway excavation area. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F15/00
Inventor 林柏泉高亚斌杨威李贺沈春
Owner CHINA UNIV OF MINING & TECH
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