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岩土类材料具有显著的率相关性,其应力-应变关系全过程一般表现为硬化-软化特征,研究如何描述这两类特征具有重要的意义。基于岩土类材料的物理变形机制分析,考虑到其结构性特征,采用弹黏塑性本构模型,引入反映材料结构变化的可变结构黏滞系数及其演化方程,并将其嵌入到弹黏塑性本构模型中去,建立能够反映材料结构变化的弹黏塑性本构模型。利用玄武岩常规三轴常应变率试验结果对所建立的模型进行试验验证,结果表明:所建立的弹黏塑本构模型能够完整、合理地描述岩土类材料应力-应变关系全过程以及材料本构关系的率相关性,同时还能够反映材料的峰值强度、残余强度特征。
Geotechnical materials have a significant rate-dependence, and the whole process of stress-strain relationship generally shows hardening-softening characteristics. It is of great significance to study how to describe these two types of features. Based on the analysis of the physical deformation mechanism of geomaterials, considering the structural features, the visco-viscoplastic constitutive model is adopted, the viscous coefficient of viscous structure and its evolution equation are introduced, which are embedded into the viscoelastic Plastic constitutive model, an elastic visco-plastic constitutive model that can reflect the change of material structure is established. The experimental results of the established normal triaxial test of basalt strain show that the established elastic-plastic visco-plastic constitutive model can describe the whole process of stress-strain relationship of geomaterials in a complete and reasonable way, Structure relationship between the rate of correlation, but also to reflect the material peak strength, residual strength characteristics.