Zobrazeno 1 - 10
of 36
pro vyhledávání: '"high-level borehole"'
Publikováno v:
Meikuang Anquan, Vol 54, Iss 10, Pp 201-205 (2023)
Aiming at the problems existing in the construction of high directional drilling in Tingnan Coal Mine roof, such as stratum breakage in open hole section, mudstone shrinkage in directional hole section, low efficiency of two-stage reaming and easy pl
Externí odkaz:
https://doaj.org/article/a33f86723a3140b39c459a1893719ed2
Autor:
GUO Chaoqi
Publikováno v:
Meikuang Anquan, Vol 54, Iss 5, Pp 182-189 (2023)
The extraction of overburden unloading gas by high level boreholes is an important technical tool for roof gas management in high gas mines. In order to further improve the effect of high level borehole gas extraction, physical similarity simulation
Externí odkaz:
https://doaj.org/article/9e72552fa1734be7aaae5a9119d15233
Publikováno v:
Frontiers in Earth Science, Vol 11 (2023)
In order to accurately determine the location of fracture zone, optimize the design parameters of high-level boreholes, and improve the effect of gas drainage, take the No. 25030 working face of Xuehu Coal Mine, Henan Shenhuo Coal & Power Co., Ltd. a
Externí odkaz:
https://doaj.org/article/2766e4c68a5a48caa75c7414fbde8d41
Autor:
GUO Xinhong, REN Zhongjiu
Publikováno v:
Meikuang Anquan, Vol 52, Iss 6, Pp 194-198 (2021)
In order to solve the problem of the uncertainty of the height when high-level boreholes are used to extract pressure relief gas from multiple sources under the condition of multiple coal seams, the isotope and gas composition of methane desorbed fro
Externí odkaz:
https://doaj.org/article/10766659eec94b67a04ce5ee01fae548
Publikováno v:
Energy Science & Engineering, Vol 9, Iss 4, Pp 520-534 (2021)
Abstract To prevent outbursts and extract the gas, it is necessary to investigate the structure of the key layer and the evolution of cracks during coal mining over a large height. A physical similarity model with a geometric similarity ratio of 1:10
Externí odkaz:
https://doaj.org/article/61faba8a22604c33bf84596a74c512a7
Autor:
JIA Mingqu
Publikováno v:
Gong-kuang zidonghua, Vol 46, Iss 8, Pp 117-122 (2020)
Directional high-level borehole in roof is an important means to control mining pressure-release gas in coal mine underground. Due to limitation of drilling device, the borehole diameter is small in once-through drilling, and borehole group arrangeme
Externí odkaz:
https://doaj.org/article/93bf2c7b27ad4a3992bb11edd0d1b0cd
Publikováno v:
Gong-kuang zidonghua, Vol 46, Iss 3, Pp 84-88 (2020)
For problems that normal roof high-level borehole hardly drilled to design position because borehole direction and dip-angle cannot be controlled, and had short effective extraction hole segment, many drainage blind areas, discontinuous drainage and
Externí odkaz:
https://doaj.org/article/f6ab6ff4364540e4a202b708660ab262
Akademický článek
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Akademický článek
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Publikováno v:
Meikuang Anquan, Vol 52, Iss 11, Pp 77-81,87 (2021)
Aiming at the problem that the CO concentration continues to exceed the limit and spontaneous combustion in the goaf after the 1413 fully mechanized mining face of Zhongxing high gas mine of Shanxi Fenxi Zhongxing Coal Industry Company has stopped mi
Externí odkaz:
https://doaj.org/article/ff08f101c2cd4de78ab3300914276eaa