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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 12    December 2016

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Mode of overlying rock roofing structure in large mining height coal face and analysis of support resistance
WU Feng-feng(吴锋锋), LIU Chang-you(刘长友), YANG Jing-xuan(杨敬轩)

School of Mines, Key Laboratory of Deep Coal Resource of Mining of Ministry of Education (China University of Mining & Technology), Xuzhou 221116, China

Abstract:The mining space of large mining height coal face is large, the range of movement and caving of rock strata is large and the stability of supports at coal face is low and damage rate of supports is high, which significantly affects the safe and efficient production of coal mines. By similar simulation experiment and theoretical analysis, the mode of fractured roofing structure of large mining height coal face and the method of determination of reasonable support resistance of the support was evaluated. Analysis shows that the structural mode of “combined cantilever beam – non-hinged roofing – hinged roofing” of the large mining height coal face appears at the roofing of large mining height coal face. The supporting factor of caved gangue at the gob is introduced, the calculating equations of the fractured step distance of roofing were derived and conventional calculating method of caved height of roofing was corrected and the method of determination of the length and height of each structural area of the roofing was provided. With reference to the excavating conditions at Jinhuagong coal mine in Datong minefield, the dimensions of structural areas of the roofing of the coal face were determined and analyzed, and reasonable support resistance of the height coal face was acquired. By selecting Model ZZ13000/28/60 support and with procedures of advanced pre-cracking blasting, the safe production of large mining height coal face was assured.

 

Key words: large mining height; roof structure; roof model; roof fracturing distance; support resistance

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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