A gob-side roadway mining method for ultra-long advancing distance working face

A mining method and a technology of advancing distance, which are used in surface mining, earthwork drilling, underground mining, etc., can solve the problems of large coal pillar size and skip mining, and achieve the effect of ensuring auxiliary transportation and simple maintenance.

Active Publication Date: 2018-02-09
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0007] The purpose of the present invention is to provide a gob-side mining method for an ultra-long advancing distance working face to comprehensively solve the large coal pillar size caused by the double-lane arrangement of the ultra-long advancing distance working face and the need for jump mining in traditional gob-along driving. The problem

Method used

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  • A gob-side roadway mining method for ultra-long advancing distance working face
  • A gob-side roadway mining method for ultra-long advancing distance working face
  • A gob-side roadway mining method for ultra-long advancing distance working face

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Embodiment

[0057] The 3-1 coal seam is mined in the 31 mining area of ​​the Chahasu Coal Mine. The thickness of the coal seam is 2.05-7.15m, with an average of 5.25m. The average dip angle of the coal seam is 1°. The researched mining face is located in the middle of mining area 31, with a dipping length of 300m and a advancing length of 5,000m. It adopts a double roadway layout, and the coal pillars between the two roadways have a clear width of 18.42m. A connecting roadway is opened every 60-70m. The remaining coal pillars and roadways are affected by two mining operations.

[0058] The stress distribution in the goaf side of the mining face (that is, the direction of the continuous working face) was measured. In the case of one mining operation (mining of the mining face), the stress peak point is 25m away from the goaf, and the maximum peak value is 22.94 MPa, for the specific stress distribution, see Figure 5(Wherein, the abscissa is the distance between one side of the continuous...

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Abstract

The invention discloses a gob-side entrydriving mining method of an ultralong-propulsion-distance working face. The ultralong-propulsion-distance working face adopts double-entry arrangement. The mining method comprises the following steps that: a, in the stope process on a stope working face, gob-side entrydriving is performed in a first coal pillar in the stope direction, so that a gob-side entry is formed in the first coal pillar, wherein the first coal pillar is the coal pillar remained through double-entry arrangement used between the stope working face and a connected working face; and b, after the stope completion of the stope working face and during the stope on the connected working face, the tunneling is continuously carried out to form the gob-side entry, and the connected working face is mined along the gob-side entry during the stope. The mining method provided by the invention has the advantages that the problem of conflict between the gob-side entry and the ultralong-propulsion-distance working face mining is solved; a gob-side entrydriving technology is applied to the mining of the ultralong-propulsion-distance working face; great coal consumption due to adoption of double-entry arrangement is reduced; and the problem that the jump mining is needed by gob-side entrydriving is solved.

Description

technical field [0001] The invention relates to a mining method of an underground coal mine, in particular to a mining method in which a working face with a super-long advancing distance adopts a double-lane arrangement combined with gob-side excavation. Background technique [0002] Gob-side entry has the characteristics of high recovery rate and easy maintenance and excavation of the roadway. It has been vigorously developed in China and achieved fruitful results. For example, Yu Zhonglin et al. Research on the optimal time for digging the roadway (Simulation and application of the reasonable position of the gob-side roadway in the large mining height working face. Journal of Mining and Safety Engineering, 2006, 33(2): 197-200), and Zhang Xuexue and others further proposed The layout technology of gob-side entry in deep coal seam groups (Determination of reasonable width of coal pillars for gob-side gob entry protection in deep coal seam groups. Journal of Coal Science, 20...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16
Inventor 王志强张俊文赵景礼李良红刘平田灵涛
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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