关键词: 率相关性, 硬化-软化, 结构黏滞系数, 弹黏塑性模型, 常应变率试验

Abstract: Rock and soil material has strong rate dependence; its complete stress-strain relation belongs to the type of hardening-softening, It is important to describe these two characteristics. Based on the analysis of physical deformation mechanism, considering the structure characteristic, the elasto-viscoplastic model is used. To set up the elasto-viscoplastic model which can describe the structure changes, the variable viscosity coefficients and its evolution equation are applied to the elasto-viscoplastic model. The result of basalt normal triaxial constant rate test is used to test the rationality of the model. The result shows that the model can completely and rationally describe the complete stress-strain relation and its rate dependence, and also the peak strength, residual strength characteristic

Key words: rate dependence, hardening-softening, structure viscosity coefficient, elasto-viscoplastic model, constant strain rate test