Coal, as a typical sedimentary rock, has a naturally anisotropic feature. For simplicity, coal is considered as an isotropic material in the study of coal permeability, and the corresponding isotropic permeability models have been proposed. However, the actual situation of gas-solid coupling in the field and laboratory tests cannot be well reflected by these models. In this paper, coal is treated as transversely isotropic, and an anisotropic permeability model is developed by using different directional mod...