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• W4295923982 abstract "Gas drainage in deep coal seam is a critical issue ensuring the safety of mining and an important measure to obtain gas as a kind of clean available energy. In order to get a better understanding of gas flow and diffusion for gas drainage in deep coal seams, a dual-zone gas flow model, including the drainage damage zone (DDZ) and the non-damaged zone (NDZ), are characterized by different permeability models and anomalous diffusion models to analyze the influence of damage induced by drilling boreholes on gas flow. The permeability model and anomalous diffusion model are verified with experiment and field data. A series of finite-element numerical simulations based on developed models are carried out, indicating that, compared with normal diffusion model, the anomalous diffusion is more accurate and appropriate to field test data. The coal fracture permeability increases rapidly with the distance decreasing from the borehole, and the area of DDZ is increasing significantly with the extraction time. Moreover, with the increasing of fractional derivative order, the diffusion model transforms the anomalous diffusion to the normal gradually, and the decay of gas pressure is aggravated. The higher value of non-uniform coefficient results in the larger increment of fracture permeability. The permeability–damage coefficient increase makes the increment of fracture permeability bigger." @default.
• W4295923982 created "2022-09-16" @default.
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• W4295923982 date "2022-09-15" @default.
• W4295923982 modified "2023-10-14" @default.
• W4295923982 title "Dual-Zone Gas Flow Characteristics for Gas Drainage Considering Anomalous Diffusion" @default.
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• W4295923982 doi "https://doi.org/10.3390/en15186757" @default.
• W4295923982 hasPublicationYear "2022" @default.
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