Triaxial creep characteristics and constitutive relation of gascontaining coal
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Abstract:
The characteristics of conventional triaxial creep are obtained via a conventional triaxial creep test of gascontaining coal under different stress levels. Mathematical fitting research regarding an experimental curve is done. A constitutive model of conventional triaxial creep of gascontaining coal is developed by improving a generalized KB model. The results show that the characteristics of conventional triaxial creep of gascontaining coal are related to the load step, and creep deformation is limited by the gas and confining pressures. Curves of the order 3ε(t) describe the three steps of conventional triaxial creep tests of gascontaining coal very well; the improved generalized KB model can represent a constitutive model of the conventional triaxial creep of gascontaining coal.
