Title:
METHOD FOR FRACTURING FILLER WALL LEFT BEHIND IN ADJACENT COAL-MINING FACE
Document Type and Number:
WIPO Patent Application WO/2016/150188
Kind Code:
A1
Abstract:
A method for fracturing a filler wall left behind in an adjacent coal-mining face, applicable in continuous pressure-relief mining of a coal seam group at a great depth. A drill hole (2) distribution scheme, parameters, and a volume of an explosive charge are designed on the basis of the size of a filler wall (1), a construction scheme for same, and a state of earlier damages of same; one to three rows of downward tilted drill holes are constructed by an advancing coal-mining face (3) on a filler wall left behind and reused by an adjacent coal-mining face (4) in a tunnel; one to two rows of the drill holes in the rear within an extremity hydraulic frame (6) are filled with the explosive charge and sealed; as the coal-mining face advances, the drill holes filled with the explosive charge in the rear within the extremity hydraulic frame enter the rear side of the coal-mining face, microcracks on the filler wall caused by earlier mining pressure are utilized to intensify cracking of the filler wall, and, combined with the effect of a lagging mining-induced stress, the filler wall left behind is ultimately fractured. The method allows fracturing of the filler wall left behind in a goaf by the adjacent coal-mining face, thus effectively eliminating an effect of stress concentration posed by the filler wall to upper and lower adjacent coal seams, implementing the goal of continuous pressure relief, and solving safety risks of adjacent coal seam mining.
Inventors:
ZHANG NONG (CN)
PAN DONGJIANG (CN)
LV CHUANGXIN (CN)
HAN CHANGLIANG (CN)
XUE FEI (CN)
PAN DONGJIANG (CN)
LV CHUANGXIN (CN)
HAN CHANGLIANG (CN)
XUE FEI (CN)
Application Number:
PCT/CN2015/095914
Publication Date:
September 29, 2016
Filing Date:
November 30, 2015
Export Citation:
Assignee:
UNIV CHINA MINING & TECH (CN)
International Classes:
E21F15/04
Foreign References:
| CN104847406A | 2015-08-19 | |||
| CN101725352A | 2010-06-09 | |||
| CN103046955A | 2013-04-17 | |||
| CN103527196A | 2014-01-22 | |||
| DE19915939B4 | 2008-02-28 | |||
| RU2283431C1 | 2006-09-10 |
Attorney, Agent or Firm:
JW IP LAW FIRM (CN)
北京德崇智捷知识产权代理有限公司 (CN)
北京德崇智捷知识产权代理有限公司 (CN)
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