Numerical simulation of gas flow in pores and fissures of coal based on segmentation of DTM threshold
WANG Gang1,2,YANG Xinxiang2,ZHANG Xiaoqiang2,LI Wenxin2,SHI Linken2
(1. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;2. College of Mining and Safety Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)
Abstract:In order to obtain the real physical model to characterize the pores and fissures of coal mass and to numerically investigate the internal gas flow,the segmentation of DTM threshold was implemented to segment the CT images. The method of DTM threshold was amended by adding Wiener filter denoising. Its correctness was validated with the three-dimensional reconstruction. The abscissa value corresponding to the maximum value of the minimum on the porosity curve was found to be the optimal threshold. Numerical simulation of gas flow was conducted based on the real physical model of pores and fissures of coal extracted using the DTM threshold segmentation method. Simulation results showed that at the micro-scale(<100 µm),the gas flowing pores and fissures agreed with the high speed nonlinear percolation of Forchheimer. The flow velocity grew rapidly in fissures and changed randomly along the direction of flow. The permeability coefficient and non-Darcy coefficient were calculated according to the fitting parameters on average flow velocity.
王 刚1,2,杨鑫祥2,张孝强2,李文鑫2,史林肯2. 基于DTM阈值分割法的孔裂隙煤岩体瓦斯渗流数值模拟[J]. 岩石力学与工程学报, 2016, 35(1): 119-129.
WANG Gang1,2,YANG Xinxiang2,ZHANG Xiaoqiang2,LI Wenxin2,SHI Linken2. Numerical simulation of gas flow in pores and fissures of coal based on segmentation of DTM threshold. , 2016, 35(1): 119-129.
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