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A new theoretical model for guiding the gas extraction in coal mines

Xie Jing (Sichuan University, College of Water Resource and Hydropower, State Key Laboratory of Hydraulics and Mountain River Engineering, Chengdu, China)
Zhang Zetian (Sichuan University, College of Water Resource and Hydropower, State Key Laboratory of Hydraulics and Mountain River Engineering, Chengdu, China)
Gao Mingzhong (Sichuan University, College of Water Resource and Hydropower, State Key Laboratory of Hydraulics and Mountain River Engineering, Chengdu, China)
Zhang Ru (Sichuan University, College of Water Resource and Hydropower, State Key Laboratory of Hydraulics and Mountain River Engineering, Chengdu, China)
Wang Man (China Pingmei Shenma Energy and Chemical Industry Group Co., LTD, Pingdingshan, China)
Jin Wencheng (Sichuan University, School of Architecture and Environment, Chengdu, China)
Luo Yi (Sichuan University, School of Architecture and Environment, Chengdu, China)

Based on the fractal-percolation properties, the equivalent permeability analysis of 3-D discrete fracture network models are investigated and analyzed for the first time. The 3-D fractal dimension was calculated with the 3-D fracture density, the mean major axis of fracture and the aspect ratio of major to minor axis. The reconstructed mining-induced fracture network model was used to validate that the correlation between the predicted and actual results is very strong in a sense. The equivalent permeability results can be adopted to guide the gas extraction in coal mines.

Keywords: gas extraction, 3-D discrete fracture network, fracture density, percolation-fractal properties, equivalent permeability analysis