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.
利用土体的塑性流动理论，提出了用于描述饱和砂土在单调荷载作用下的应力—应变反应性质的弹塑性本构模型。
Based on the plastic flow theory of soils, an elastoplastic constitutive model for describing the stress-strain behavior of the saturated sands under the action of monotonic loading is developed.
利用土体的塑性流动理论，提出了用于描述饱和砂土动力反应性质的弹塑性本构模型。
Based on the plastic flow theory of soils, an elastoplastic constitutive model for describing the dynamic behavior of the saturated sands is developed.
基于砂土的常规三轴试验，利用岩土本构关系的数值建模方法，建立砂土的弹塑性本构模型。
Based on the conventional triaxial experiments for sand, the elastoplastic constitutive model of sand is built up through the numerical method of modeling the constitutive law for rock and soil.
基于砂土的常规三轴试验，利用岩土本构关系的数值建模方法，建立砂土的弹塑性本构模型。
Based on the conventional triaxial experiments for sand, the elastoplastic constitutive model of sand is built up through the numerical method of modeling the constitutive law for rock and soil.
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