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Abstract Physical information monitoring are significant for the prediction of dynamic disasters such as coal and gas outburst under the unloading process of coal rock. The gas permeability and charge induction experiment have been done under the confining pressure unloading of containing-gas coal rock by using the charge collection device independently developed. The results show that the gas permeability characteristics and charge induction regularity closely associate with the deformation damage in the process of the confining pressure unloading of containing-gas coal rock. With the increase of confining pressure unloading rate，a large number of micro crack propagation，the coal rock deformation damage has been promoted，the mutation probability from partial bound charge to free charge increases in the internal cracks of coal rock，the inductive charge has a significant increase produced in the main rupture process of coal rock. The confining pressure unloading weakens the hoop restrictions of coal rock. New gas channels are added inside coal rock and it makes the permeability of coal rock increase. Streaming current formed by the friction action between coal particles carried by gas and coal rock holes wall. It contributes additional amount to the coal rock charge signal and enhances the charge signal.
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2015, Vol. 34 
