剪胀性是砂土本构模型一个关键问题。
Dilatancy is the key issue to describe the constitutive behaviors of sand.
有限元解析中所采用的砂土本构模型以修正塑性应变能量为硬软化基本参量，它可以较为精确地模拟砂土的应力路径效果。
The constitutive model is developed to have a stress path-independent work-hardening parameter based on the modified plastic strain energy concept.
研究结果表明，与现有的砂土本构模型相比，所提出的模型能更好地模拟应力路径及加载速率变化对砂土变形和强度特征的影响。
It is shown that the proposed model can much better simulate the effects of stress path and loading rate on the deformation and strength characteristics of sandy soil than the previous models.
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