【摘要】 通过分析季节冻土区的温度分布规律,建立了温度随时间的变化函数。在此基础上,基于连续介质力学和热力学理论,建立了道路水分迁移过程中的水热耦合动力学模型,并对季节性冻土地区的水分迁移现象进行数值模拟分析,初步探讨了在非等温冻结条件下,水热耦合过程中路基填料的含水量和温度随时间和深度变化的关系,计算结果表明,冻结过程中在冻结峰面附近形成一个冻结含水量峰值,且该峰值随着冻结时间的延长而向深度发展,这对于路基路面的综合设计,道路冻害的预报有着重要的理论意义和实际应用价值。但要真正体现道路路基水分迁移的机理,有待于建立水分迁移过程中水、热、动载和渗流耦合模型,这是有待于进一步解决的问题。更多还原

【Abstract】 By analyzing the rule of temperature distribution in seasonal frozen soil area, the function of temperature with time is established. A dynamics coupling model of moisture and heat in the process of moisture migration in roadway is established based on the theory of continuum mechanics and the thermodynamics. The numerical simulation analysis is studied for the moisture migration phenomena of seasonal frozen soil area ; and the soil moisture content and temperature change with time and depth are discussed under the condition of transient temperature and the coupling process of moisture-heat. The results indicate that a peak of frozen moisture content is formed in frozen peak surface, which is developed for depth change with time increased. It would be theoretic significance and practical value to the design of roadbed and pavement and prediction of frosting harm for roadway. Furthermore, the coupling model of moisture, heat, dynamic load and seepage flow will have to be established for truly embodying the moisture migration mechanism of roadbed, which remains to be solved.更多还原