A model of the growth of an ice lens in a saline porous medium is developed. At high lens growth rates the pore fluid becomes supercooled relative to its equilibrium Clapeyron temperature. Instability occurs when the supercooling increases with distance away from the ice lens. Solute diffusion in the pore fluid significantly enhances the instability. An expression for the segregation potential of the soil is obtained from the condition for marginal stability of the ice lens. The model is applied to a clayey silt and a glass powder medium, indicating parameter regimes where the ice lens stability is controlled by viscous flow or by solute diffusion. A mushy layer, composed of vertical ice veins and horizontal ice lenses, forms in the soil in response to the instability. A marginal equilibrium condition is used to estimate the segregated ice fraction in the mushy layer as a function of the freezing rate and salinity.

中文翻译：

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盐渍土中冰晶状体的稳定性

开发了一个冰晶状体在盐水多孔介质中生长的模型。在高透镜生长速率下，孔隙流体相对于其平衡克拉珀龙温度变得过冷。当过冷度随着远离冰晶状体的距离而增加时，会发生不稳定性。孔隙流体中的溶质扩散显着增强了不稳定性。从冰晶状体的边际稳定性条件获得土壤分离潜力的表达式。该模型应用于粘土质淤泥和玻璃粉介质，表明冰晶稳定性受粘性流或溶质扩散控制的参数状态。由垂直冰脉和水平冰透镜组成的糊状层在土壤中形成以应对不稳定。