A viscoelastoplastic creep model of outburstprone coal under triaxial compression

Using selfmade creep seepage experimental apparatus, triaxial creep tests on outburst prone coal are carried out with coal samples taken from Songzao Coal Mine. It is found that the attenuation creep property is shown in the conditions of less than its longterm strength load, while nonattenuation creep property for the greater conditions. By introducing a viscoelastoplastic body which can describe the deformation property of nonNewtonian fluids, the viscoelastoplastic creep model of outburst prone coal is put forward combined with a PoytingThomson model. The model parameters were fitted out with Matlab programmer and validation is employed. It is found that the test results were in good agreement with those by the proposed model.

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