Unfrozen water content has strong control on the permeability, strength and thermal properties of frozen soil. Several techniques have been used to measure unfrozen water content in frozen soil and many models have been developed for its prediction. However, there has been little investigation on the quantitative analysis of the relationship between pressure and unfrozen water content. With the development of artificial ground freezing techniques and deep mining, knowledge of unfrozen water content in frozen soil under high pressure is critical to the stability of the frozen structures. Here, a new predictive model is presented based on the relationship between chemical potential and unfrozen water content and a previous empirical formula. The simulation results are in good agreement with those from laboratory tests. Both the theoretical analysis and the test results indicated that: (a) the pressure applied to frozen soil reduces the freezing point of bulk water and delays the phase change, and (b) unfrozen water content increases with increasing pressure, and at higher pressures the change is greater. The results improve our understanding of the physical and mechanical properties of freezing soil under pressure for artificial ground freezing applications and deep mining engineering.

中文翻译：

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包括压力影响的未冻水含量预测模型

未冻水含量对冻土的渗透性、强度和热学性质有很强的控制作用。已经使用了几种技术来测量冻土中未冻水的含量，并且已经开发了许多模型来预测它。但对压力与未冻水含量关系的定量分析研究较少。随着人工地面冻结技术和深部开采的发展，了解高压下冻土中未冻结水的含量对冻结结构的稳定性至关重要。在这里，基于化学势与未冻结水含量之间的关系以及先前的经验公式，提出了一种新的预测模型。模拟结果与实验室测试结果吻合良好。理论分析和试验结果均表明：(a) 施加在冻土上的压力降低了大量水的冰点并延迟了相变；(b) 未冻水含量随着压力的增加而增加，并且在更高的压力下，变化更大。结果提高了我们对人工地面冻结应用和深部采矿工程压力下冻结土壤的物理和机械特性的理解。