论季节冻土的冻胀沿冻深分布

本文根据甘肃省1979年以来的渠道冻胀试验成果,得出了4种冻胀沿深度分布的类型及其与地下水位和土质条件的关系。其分布规律可用水分迁移理论加以解释。所谓“主冻胀层”概念仅适用于封闭冻结系统。根据一个简化的水热迁移模型计算也证实了地下水热影响。

On the Frost Heave Distribution Along Depth

The type of frost heave distributions along depth is of importance for determining the depth of foundation embedment and subsoil replacement in the seasonal frost area.Based on the results from the field experiments carried out in Gansu Province since 1979, four type of the frost heaves distribution along depth are summaried and their corresponding soil water conditions presented.It is found that when the partial replacement of subsoil 13 adapted the heave profile will changed.The experimental results can be explained by the theory of water migration in frozen soil.The concept of so called "major heave zone" is correct only in the closed freezing system while in the open system various types of distributions exit due to the change of water sapply conditions.The significant effect of ground water can also be verified by a simplified model of the coupled heat-moisture transfer.