hydraulic conductivity

Most classical predictive models of hydraulic conductivity rely on pore bundle concept that only accounts for capillary flow and neglects the water film flow. Considering the water transport in water film, water in the capillary flow tube was divided into free water and water films with Newton fluid. The viscosities of free water and water films are different. Then, a novel prediction model for hydraulic conductivity of frozen soil was proposed based on the capillary flow theory. The model parameters can be easily obtained from laboratory tests.绝大多数经典的渗透系数（hydraulic conductivity）预测模型均基于孔隙束概念（pore bundle concept），仅考虑毛细流动（capillary flow）过程，却忽略了水膜流动（water film flow）的影响。考虑水膜内的水分运移规律，将毛细流道内的水分划分为自由水与呈牛顿流体（Newton fluid）特性的水膜，且自由水与水膜的黏度存在差异。基于毛细流动理论，本文提出了一种全新的冻土（frozen soil）渗透系数预测模型，该模型的参数可通过室内试验便捷获取。