Title: The numerical simulation of permeability rules in protective seam mining

Authors: Cun Zhang; Shihao Tu; Lei Zhang; Fangtian Wang; Qingsheng Bai; Hongsheng Tu

Addresses: School of Mines, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, Xuzhou 221116, China ' School of Mines, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, Xuzhou 221116, China ' School of Mines, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, Xuzhou 221116, China ' School of Mines, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, Xuzhou 221116, China ' School of Mines, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, Xuzhou 221116, China ' School of Mines, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, Xuzhou 221116, China

Abstract: The protective seam mining has become one of the most important measures of preventing outburst hazard in the deep outburst coal seam. The comprehensive study of gas permeability change rules and gas seepage rules of the protected seam close to the protective seam in the mining process of the protective seam need to be carried out. Based on the current researches, the secondary development of flow model using FISH language is embedded in FLAC3D. Combined with the in situ conditions, the permeability changes in the process of protective seam mining are simulated by the modified models. Based on the above information, the seepage of gas is analysed, seepage path of pressure-relief gas and the distribution of gas pressure in protected seam are obtained. The simulated results provide the theoretical foundation for guiding the field practice and the field data analysis also confirm the correctness of the model. [Received: December 12, 2014; Accepted: July 4, 2015]

Keywords: numerical simulation; gas permeability rules; protective seam mining; gas pressure; gas seepage path; coal mining; deep outburst coal seams; flow modelling; simulation.

DOI: 10.1504/IJOGCT.2016.079268

International Journal of Oil, Gas and Coal Technology, 2016 Vol.13 No.3, pp.243 - 259

Received: 29 Dec 2014
Accepted: 04 Jul 2015
Published online: 26 Sep 2016 *

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