【摘要】 通过室内试验研究获得动荷载作用下人工冻黏土蠕变特性,冻结黏土的动蠕变曲线分为3个阶段:初始蠕变阶段、稳定蠕变阶段和渐进流阶段。依据人工冻土室内动三轴试验结果,基于动力学、连续介质力学和冻土力学原理,建立人工冻土在动荷载作用下的本构模型,即弹-黏弹-黏塑性本构模型。将改进的西原模型成功添加到ADINA软件平台中,利用该模型对人工冻黏土在动荷载作用下的蠕变进行有限元数值仿真,得出的有限元计算结果与试验结果相近。更多还原

【Abstract】 This paper obtained the artificially frozen soil creep features under dynamic load by the experimental study.The dynamic creep curve of the frozen clay was divided into three stages: the initial creep stage,the steady creep stage and accelerated creep stage.This paper,in accordance with the dynamic triaxial test results of the artificially frozen soil,based on the dynamics,continuum mechanics and frozen soil mechanics principles,established the creep constitutive model of the artificially frozen soil under dynamic load,that was the elastic-viscoelastic-viscoplastic constitutive model.The improved Xiyuan Model was successfully embedded in ADINA FEM.Using this Model,the artificially frozen soil creep under dynamic load was carried on finite element numerical simulation.The results of experiments were close to the calculated ones.更多还原