Title: Study on mining method of cretaceous coal seam under the aquifer of outcrop area in Golden Concord coal mine

Authors: Jianghua Li; Yanchun Xu; Wenzhe Gu

Addresses: School of Resource and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China ' School of Resource and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China ' School of Resource and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Abstract: As coal seam of Golden Concord coal mine occurs in cretaceous, outcrop mining area is threatened by tertiary gravel aquifer. This paper determines the water abundance of outcrop area through pumping test, analyses the physical mechanical properties and composition of cretaceous strata, and also researches the damage characteristics of cretaceous rock by field measurement and similar simulation experiment. The final conclusion includes: 1) the water abundance of tertiary gravel aquifer is weak; 2) the cretaceous rock strata belongs to weak type; 3) the ratio of caving zone and mining height, and the ratio of fracture zone and mining height are very close through field measurement and similar simulation experiment, and using the measured data to predict the 'two zones' height; 4) using different mining methods in different outcrop areas. This research could liberate amount of coal in the outcrop area, and guarantee the continuous safety production of the coal mine.

Keywords: mining methods; cretaceous coal seams; tertiary gravel aquifers; outcrop areas; pumping test; field measurement; simulation; overburden failure law; caving zone; fissure zone; water abundance; cretaceous rock strata; mining height; coal mines; continuous production; mine safety.

DOI: 10.1504/IJMME.2015.071178

International Journal of Mining and Mineral Engineering, 2015 Vol.6 No.3, pp.276 - 293

Received: 16 Aug 2014
Accepted: 11 May 2015

Published online: 13 Aug 2015 *

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