摘要
基于刚性冰假定和水动力学模型,将土体视为弹性体,建立了考虑应变对水分迁移影响的饱和土冻结过程中水-热-力的耦合动力学模型,利用有限元法和差分法对饱和土冻结过程中水-热-力的耦合作用进行了数值研究,给出了冻土中含水量和应力沿高度的分布规律,讨论了冻结时间、温度边界条件对冻土中含水量分布及应力分布的影响。研究结果表明:受土体冻结过程中水分向冻结锋面附近迁移的影响,冻结锋面附近的含水量逐渐增加,引起该处应力逐渐增大,从而导致土体发生冻胀变形。
Based on the assumption of rigid ice and the hydrodynamic model, regarding the soil as elastic, the dynamic model of the coupled moisture-heat-stress process is established considering the influence of the strain due to the moisture migration. By means of the finite element method and the finite difference method, this paper analyzes numerically the coupled process of the moisture-heat-stress fields in saturated soil during freezing. The variations of water content and stress over height in saturated soil during freezing are obtained. The influences of the freezing time and the temperature boundary condition on the distributions of water content and stress are further discussed. The numerical results demonstrate that the water content increases gradually neighboring the freezing front, because the moisture migrates to the freezing front during the freezing process, which leads to the increase of the stress near the freezing front, which in turn causes the frost deformation in frozen soil.
出处
《工程力学》
EI
CSCD
北大核心
2009年第4期246-251,共6页
Engineering Mechanics
基金
教育部"新世纪优秀人才支持计划"项目(NCET-04-0979)
关键词
冻土
耦合
数值研究
含水量
温度
应力
frozen soil
coupled
numerical research
water content
temperature
stress
