A method for gas outburst coal seam coal roadway excavation with down-blast, up-crowd, outburst and dust reduction
A technology of gas outburst and coal roadway, which is applied in the fields of downburst, upper crowding, outburst elimination and dust reduction in coal seam roadway excavation of gas outburst coal seam, which can solve problems such as difficulty in excavation, difficulty in gas extraction, and impact on personnel health, so as to improve gas extraction Efficiency, improvement of working environment, and reduction of dust concentration
Active Publication Date: 2020-02-07
ANHUI UNIV OF SCI & TECH
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Problems solved by technology
[0004] Coal roadway excavation in coal seam is the premise of working face mining, but it is extremely difficult to carry out coal roadway excavation in outburst coal seam
On the one hand, the air permeability of outburst coal seams is generally low, without the protection of the protective layer and floor roadway, the gas extraction in front of the coal roadway excavation face is extremely difficult, and it is difficult to effectively eliminate the outburst danger of coal roadway; on the other hand, the outburst Coal seams are generally dry and soft, and thick dust is easily generated during the excavation process, which greatly affects the health of personnel
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[0029] The present invention is described further below:
[0030] A method for gas outburst coal seam roadway excavation by lower explosion and upper extraction to eliminate outburst and reduce dust, comprising the following steps:
[0031] 1. At 8 meters behind the coal roadway excavation face (1), construct a drilling field (2) on both sides, and the length of the drilling field (2) is 10 meters;
[0032] 2. In each drilling site (2), construct inclined rock holes (3) with a length of 1 meter and a depression angle of 30 degrees, and continue to construct horizontal floor rock holes (4) with a length of 60 meters along the tunneling direction of the coal roadway. ), the number of horizontal floor rock boreholes (4) is 2;
[0033] 3. On the drilling site (3) and the coal roadway driving face (1), construct a row of extraction boreholes (5) and a row of water injection boreholes (6) respectively into the coal seam, and the number of extraction boreholes (5) is 10, the hole s...
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The invention discloses a down-explosion and up-extrusion outburst elimination and dust falling method for coal road tunneling in a gas outburst coal seam. The resonance effect of explosive columns which explode simultaneously in a plurality of horizontal base plate rock drill holes is fully used to enable the coal seam and a rock stratum at the upper side to generate a large amount of fractures, sufficient disturbance and loosening are conducted on the coal seam in the area, the gas extraction efficiency of an extraction drill hole is improved, and accordingly the outburst elimination is achieved; after a large quantity of gas is extracted, the gas pressure is decreased greatly, the resistance of injecting water into the coal seam can greatly be decreased, at this time, a large quantity of water is injected through a water injection pipeline, the water can permeate downwards under the dead weight function, not only is a coal body softened, but also the dust concentration in the tunneling process is reduced, and the working environment is improved. The method is simple in operating and easy to achieve.
Description
technical field [0001] The invention relates to the field of outburst elimination in coal seams, in particular to a method for downburst, upcrowding, outburst elimination and dust reduction in tunneling of gas outburst coal seam coal roadway. Background technique [0002] Most mining areas in my country have entered deep mining. The gas content in deep coal seams increases and the gas pressure in coal seams is higher, which leads to extremely high risks of coal and gas outburst during the mining process. [0003] In order to eliminate the danger of coal seam outburst, gas drainage in coal seam is the fundamental measure to prevent coal and gas outburst. my country's coal and gas outburst coal seams generally have the characteristics of high gas content and low gas permeability, and the gas extraction efficiency is extremely low. In order to extract coal seam gas efficiently, it is essential to take necessary anti-permeation measures, such as mining protection layer, floor r...
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IPC IPC(8): E21F7/00E21F5/02
CPCE21F5/02E21F7/00
Inventor 马衍坤刘静杜肖黄文尧刘健刘泽功
Owner ANHUI UNIV OF SCI & TECH