Estimating unfrozen water content in unsaturated frozen soils based on soil water characteristic curve
Theoretical analysis of unfrozen water content in unsaturated soil below freezing temperature is conducted,presenting a simple prediction method and its mathematical model.By considering the chemical and mechanical balance of gas-liquid phases in unsaturated soil pores,along with the soil-water characteristic curve,the soil pore volume distribution density function is derived using parameters from the Van Genuchten soil-water characteristic curve model.The relationship between the maximum pore size filled with liquid water at initial effective saturation and initial crystal pore size at a specific freezing temperature is examined to analyze ice-water phase transition characteristics in soil pores and critical effective saturation.Freezing occurs only if initial effective saturation surpasses critical crystallization saturation.A formula for predicting unfrozen water saturation in unsaturated soil below freezing temperature is provided and validated against existing experimental data.
unfrozen water contentfrozen soilssoil-water characteristic curveprediction model
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