Abstract Knowledge of the hydraulic conductivity of warm frozen soil is crucial for accurately calculating the deformation of buildings built in permafrost, and the objective of this study is to provide an experimental and theoretical method for obtaining the hydraulic conductivity of warm saturated frozen soil. The permeability experiments were carried out on warm frozen soil in the low temperature rock triaxial testing system, which provides a precise measurement of the water flow rate through the warm frozen soil. Repeated experiments were conducted to verify the validity of the experimental results. Subsequently, based on the experimental results and given the shortcomings of the ice impedance model, the equivalent model was proposed to predict the hydraulic conductivity of saturated frozen soil. The model suggested that saturated frozen soil and unsaturated unfrozen soil with the same liquid water content have the same hydraulic conductivity. To illustrate the validity of the model, the predictions of seven hydraulic conductivity models for unsaturated unfrozen soil were compared with the measured hydraulic conductivity of saturated frozen soil. The results show that the predictions are close to the measured data, which shows the validity of the model. Thus, the hydraulic conductivity of saturated frozen soil can be directly predicted by the hydraulic conductivity model for unsaturated unfrozen soil. The results provide a new method for obtaining the hydraulic conductivity of saturated frozen soil, which can provide a reference for the design and construction of buildings built in permafrost.

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饱和冻土与非饱和未冻土导水率比较

摘要 了解暖冻土的导水系数对于准确计算多年冻土中建筑物的变形至关重要，本研究的目的是为获得暖饱和冻土的导水系数提供一种实验和理论方法。在低温岩石三轴测试系统中对暖冻土进行渗透率实验，该系统可精确测量通过暖冻土的水流量。进行了重复实验以验证实验结果的有效性。随后，基于实验结果，针对冰阻抗模型的不足，提出了等效模型来预测饱和冻土的导水率。该模型表明，相同液态水含量的饱和冻土和非饱和未冻土具有相同的导水率。为了说明模型的有效性，将七个非饱和未冻土的导水率模型的预测与饱和冻土的实测导水率进行了比较。结果表明，预测结果与实测数据接近，说明模型的有效性。因此，饱和冻土的导水率可以通过非饱和未冻土的导水率模型直接预测。研究结果为获取饱和冻土的导水率提供了一种新方法，可为多年冻土中建筑物的设计和施工提供参考。