摘要
利用土体的塑性流动理论,提出了基于SMP破坏准则的土体弹塑性动力本构模型,用于描述饱和砂土的动力反应性质。土体总的变形由3个部分组成:弹性应变、与体积屈服机制相关的塑性应变和与剪切屈服机制相关的塑性应变。土体在初始加载与卸载和重新加载阶段性质的差别通过采用不同的模型参数加以反映。通过将应用该模型模拟计算的结果与试验结果进行对比,表明该模型能够较为准确地描述饱和砂土在循环加载条件下的反应性质,具有较少的模型参数,这些参数都可以通过常规的三轴压缩试验和静水压力试验进行确定。同时,该模型的形式比较简单,可用于数值计算中。
Based on the plastic flow theory of soils, an elastoplastic constitutive model for describing the dynamic response behavior of the saturated sands is developed. The total deformation of soils consists of three parts： elastic strain, the plastic strain related to the volumetric yielding mechanism and the plastic strain related to the shear yielding mechanism. The difference of soils behavior in virgin loading contrast to unloading and reloading can be reflected by adopting different model parameters. By comparing the results calculated by the model with the test data, it is shown that the presented constitutive model can describe the response behavior of saturated sands subjected to cyclic loading with reasonable accuracy. The number of the model parameters is limited and their value can be calibrated through conventional triaxial compression test and hydrostatic pressure test. In the meantime, the form of the constitutive model is simple and it is suitable for numerical calculation.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第18期3380-3385,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(50178005)
国家自然科学基金杰出青年基金资助项目(50325826)
关键词
土力学
饱和砂土
本构模型
动力
弹塑性
破坏准则
soil mechanics
saturated sands
constitutive model
dynamic
elastoplasticity
failure criterion
