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JI Ming1,*£¬ Gao Feng1,£¬ Xu Xiaoli2,£¬ Zhang Yu1,
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1¡¢Department of Mechanics, College of Science, China University of Mining and Technology£» 2¡¢The School of Architecture and Civil Engineering£¬Nantong University£» £©
Abstract£º
The differential visco-elasto-plastic constitutive equation under the condition of uni-axial compression has been deduced based on the Nishihara rheological model with the help of considering the spring¡¯s coefficients of thermal expansion. Through the analysis of creep and unloading curve, the Nishihara rheological model considering the effects of humidity is in a stable creep while the stress is low, which contains instantaneous elasticity¡¢elasticity aftereffect and viscosity flow aroused by humidity . The model in a high stress is in an unstable creep, which also contains instantaneous elasticity¡¢elasticity aftereffect, but the viscosity flow is aroused by the humidity and stress. The creep properties of rock under the humidity can be comprehensively reflected by this model.
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