Title: Impacts of long-term water inrush on characteristics of coal gas adsorption and seepage

Authors: Yongliang Yang; Qiang Zhang; Fanjun Gu; Zenghua Li; Shisong Hou

Addresses: School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221116, China ' School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221116, China ' School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221116, China ' School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221116, China ' State Key Laboratory Coal Resources and Safe Mining, Xuzhou, 221116, China

Abstract: Frequent coal mine flooding is bound to impact not only the stope stress effects of working face, but also the absorption and seepage characteristics of coal mass. In this paper, we examined the effects of long-term water inrush on coal pore structure as well as gas adsorption and seepage characteristics using water-flooded Taoyuan Coal Mine, Anhui Province, China, as an example. Results showed that: 1) after water inrush, the volume, area, and porosity of coal samples, as well as the proportion of micro-pores decreased significantly with the distance from the water inrush site increasing; 2) the amount of gas adsorption of coal samples near the water inrush site was higher than that away from the site; 3) within 13 m from the site, the seepage capacity of coal gas increased; 4) the water seeped into the coal dissolves a mass of inorganic minerals and organic matter and carries them away. [Received: December 26, 2014; Accepted: June 13, 2015]

Keywords: water inrush; coal gas; pore structure; gas adsorption; seepage capacity; long-term inrush; coal mine flooding; coal mining; coal pore structure; China; inorganic minerals; organic matter.

DOI: 10.1504/IJOGCT.2016.079259

International Journal of Oil, Gas and Coal Technology, 2016 Vol.13 No.3, pp.305 - 320

Received: 29 Dec 2014
Accepted: 15 Jun 2015
Published online: 26 Sep 2016 *

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