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Abstract The combination method of the laboratory experiment and field experiment is used. Coal permeability stress sensitivity experiment，complete stress-strain permeability measurement experiment，and the permeability measurement field experiment of mining coal are carried out to study the coal permeability evolution laws. The results of all the experiments are compared to find the difference and the relation among the three experiments. The stress intensity and loading-unloading history are the main influencing factors for the permeability evolution of coal. The permeability value is magnitudes 2–4 lower for the laboratory scale against the engineering scale. The scope of application of the three experimental methods is summarized so as to provide reliable support for the correct choice of coal permeability.
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Received: 02 March 2010
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