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Abstract The mathematical relationship between the creep parameters and the degree of saturation of the low-grade metamorphic slate was established based on the experimental data of uniaxial creep under different moisture states. It is found that the higher the degree of saturation of the rock，the smaller the creep parameters. The instantaneous elastic modulus varies linearly with the degree of saturation. The viscous modulus and the coefficient of viscosity vary exponentially with the degree of saturation. The damage of the rock induced by water is considered as the damage of each creep parameter. The variables defining damage and the variation of damaging are determined according to the experimental results. Then creep equation for the low-grade metamorphic slate considering water damage is established. The constitutive model is incorporated into the software FLAC3D. The results from the compressive creep test and the numerical calculation verify the rationality of the model.
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Received: 15 September 2014
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2014, Vol. 33 
