多年冻土地区路基变形场和应力场的数值分析

为了研究冻土的冻胀特性对公路路基稳定性的影响,建立了冻土路基变形场及应力场的二维数值计算模型,并应用有限元法求解路基土体冻结时变形场和应力场的分布规律.分析了土基范围内冻胀带对路基应力场和变形场的作用,并计算了不同冻胀带范围对路基顶面变形场和应力场的影响.结果表明:冻胀带的存在是引起路基病害的直接原因,不同冻胀带范围将引起路基产生不同类型及不同规模的破坏,位于路面以下的冻胀带属于敏感冻胀带范围.

Numerical Analyses of Deformation and Stress Fields in Permafrost Regions

In order to study the features of freeze-thaw settlement in the permafrost,in this paper a two-dimensional numerical model of deformation and stress fields in embankment is established,together with finite element method,to calculate the distributions of deformation and stress fields of the freezing soil in an embankment.The variation of stress and deformation fields in the freezing zone of an earth embankment is analyzed,and the effect of different frost-heaving zones on the deformation and stress of embankment surface is calculated.The calculations show that the frost-heaving zone causes damage directly to an embankment, different sensitivity of frost-heaving zone will bring different damage,and the freezing zone under a pavement is a sensitive frost-heaving zone.