路基冻结过程中温度场对变形场的影响  

Effect of temperature field on deformation field during freezing process of subgrade

作　　者：毛雪松[1] 王秉纲[1] 胡长顺[1] 李宁[2] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]西安理工大学水利水电学院,陕西西安710048

出　　处：《长安大学学报（自然科学版）》2005年第5期11-14,共4页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(50178010)

摘　　要：为了研究冻土路基温度场及变形场的动态变化规律,基于伴有相变的路基非稳态温度场控制方程和冻土路基变形场二维数值计算模型,对冬季冻土路基温度场和变形场进行了计算分析,得出路基深层土中的温度变化滞后于表层土和气温;对于冻胀冰锋线分布较广的路基,其破坏易在坡脚处产生;冻胀冰锋线分布范围较小的路基,破坏大致发生在竖向位移较大的路基中部。结果表明,冻胀冰锋线的范围是影响路基变形场的重要因素。In order to study the dynamic drift of temperature field and deformation field in permafrost embankment, this paper calculates and analyzes the temperature field and the deformation field in winter based on non-stationary temperature field control equation with phase changing and two-dimensional numerical calculation model of deformation in subgrade. The results indicate that the temperature change of the deep soil is slower than both the surface soil and the circumstance temperature. In the broad freezing line subgrade, the damages appear at toe of slope; in narrow frost-heaving frontal line subgrade, the damages appear at the middle of subgrade with large vertical displacement. It is pointed out that the scope of frost-heaving frontal line is the key factor that affects the deformation field in the embankment. 5 figs, 6 refs.

关 键 词：道路工程 冻土路基 冻胀冰锋线 非稳态温度场 变形场 

分 类 号：U461.168[机械工程—车辆工程]