长春市道路冻胀耦合模型研究

在季节性冻土地区,道路随季节交替发生冻融循环变化.本文讨论了土质、温度、含水量、荷载对冻胀的影响,将水、热、力进行综合分析,建立了长春市道路的冻胀耦合模型,研究了冬季冻结过程的温度、湿度及应变的变化规律:(1)路基土体内的水分向冻结锋面的迁移,使冻结区含水量增加,在冻结稳定后,在冻结锋面附近形成一个含水量峰值约60%;(2)路基内的温度由开始的不均衡状态逐渐向线性分布发展;(3)因冻胀其体积应变随着冻结深度的增加而减小,在冻结锋面上体积应变也达到了极值.

Research on Coupled Model of the Road in Changchun City

In the area of seasonal frozen region,the road takes place the cycle of freezing and thawing variety with the season.It means that influence of soil conditions,temperature,water content,load conditions are analyzed.By Synthesize analyzing the water,the heat and the stress,this paper constructs the water-heat-stress coupling mathematics model for the road of Changchun.And then the law of the moisture filed,temperature field and stress field in structure system of the road of Changchun is made.(1) In the 60-day freeze process,the moisture moves toward the freezing front and increases.After freezing stability,soil water content to be the ultimate value about 60%.(2) The temperature of the roadbed and road surface developed from the start unbalanced distribution to the linear.(3) On account of frozen,the volume stain is reduce through the increasing freezing depth and content to be the ultimate value.