Ice content is a critical parameter affecting the hydrological, thermal, and mechanical properties of frozen soil. However, it is hard to capture in-situ ice contents due to the limitations of conventional geotechnical monitoring techniques. A new method of ice content measurement for frozen soil has been recently proposed using the actively heated fiber Bragg grating (AH-FBG) sensors. This study aims to examine the feasibility of this measuring technique and investigate some critical factors related to in-situ monitoring. A series of laboratory calibration tests were performed on frozen soil specimens at the initial temperature of −17 °C. The thermal conductivities of the specimens were measured by the proposed method and compared with the results obtained using a heat transfer analyzer. To verify the effectiveness of ice content calculation and estimate the measuring accuracy while considering the presence of unfrozen water, the ice contents recorded by frequency domain reflectometry (FDR) sensors were used to provide the theoretical calculation equation of ice content reference values. Furthermore, a two-dimensional axisymmetric finite element numerical model was built to explore the influencing factors of the AH-FBG method. The experimental results indicate that this method can be used as a reliable tool for measuring ice content but have certain limitations. The series model is found to be the most suitable model for calculating thermal conductivity and ice content based on temperature changes. The numerical simulation results show that this method is applicable to ice content measurement when the initial temperature is below −6 °C and the heating duration is over 110 s. The maximum normalized radius of influence of this measuring technique is 14. To refine the proposed method for field monitoring, further studies are needed to solve these limitations and expand the scope of application.

冰含量是影响冻土水文、热力和机械特性的关键参数。然而，由于传统岩土监测技术的局限性，很难捕获原位冰含量。最近提出了一种使用主动加热光纤布拉格光栅 (AH-FBG) 传感器测量冻土冰含量的新方法。本研究旨在检验这种测量技术的可行性，并调查与原位监测相关的一些关键因素。在-17°C的初始温度下对冻土标本进行了一系列实验室校准测试。通过所提出的方法测量样品的热导率，并与使用传热分析仪获得的结果进行比较。为了验证冰含量计算的有效性并在考虑未冻结水的情况下估计测量精度，使用频域反射计 (FDR) 传感器记录的冰含量提供冰含量参考值的理论计算公式。进一步建立了二维轴对称有限元数值模型，探讨了AH-FBG方法的影响因素。实验结果表明，该方法可作为测量冰含量的可靠工具，但存在一定的局限性。发现级数模型是最适合基于温度变化计算导热系数和冰含量的模型。数值模拟结果表明，该方法适用于初始温度低于-6°C且加热时间超过110 s时的冰含量测量。这种测量技术的最大归一化影响半径为 14。为了改进所提出的现场监测方法，需要进一步研究以解决这些限制并扩大应用范围。