Based on the thermal integrity testing method of foundation pile, distributed optical fiber temperature sensing (DTS) technology was applied to testing the integrity of a cast-in-place pile. A theoretical model was established for the heat transfer and temperature characteristics in consideration of the physical properties of piles and the surrounding media. By establishing a model of a pile with and without covering soil, the thermal conduction of piles could be studied effectively. The results showed that, at the same heating power, the temperature rise of each layer optical fiber in the pile was basically the same when the ambient temperature around the pile did not change by more than 7.0 °C and the soil temperature around the pile did not change by more than 3.1 °C. At the same soil temperature, the temperature rise of each layer optical fiber in the pile increased with an increase in heating power. Further, we studied the heat conduction characteristics of the pile after the soil was compacted. The results showed that the experimental temperature rise in layers F1–F6 was basically consistent with that of the theoretical temperature rise. After the soil around the model pile was compacted, the thermal conductivity of soil was increased, the further contact between the pile and soil interface was enhanced, which accelerated the thermal diffusion of the pile.

在基础桩热完整性测试方法的基础上，采用分布式光纤温度传感（DTS）技术对现浇桩进行完整性测试。考虑到桩和周围介质的物理特性，建立了传热和温度特性的理论模型。通过建立有和没有覆盖土的桩的模型，可以有效地研究桩的热传导。结果表明，在相同的加热功率下，当桩周围的环境温度变化不超过7.0°C，且桩周围的土壤温度发生变化时，桩内各层光纤的温升基本相同。变化不超过3.1°C。在相同的土壤温度下 堆中每层光纤的温度升高随着加热功率的增加而增加。此外，我们研究了压实土壤后桩的导热特性。结果表明，F1-F6层的实验温升与理论温升基本一致。压实模型桩周围的土壤后，提高了土壤的导热系数，增强了桩与土界面的进一步接触，加速了桩的热扩散。结果表明，F1-F6层的实验温升与理论温升基本一致。压实模型桩周围的土壤后，提高了土壤的导热系数，增强了桩与土界面的进一步接触，加速了桩的热扩散。结果表明，F1-F6层的实验温升与理论温升基本一致。压实模型桩周围的土壤后，提高了土壤的导热系数，增强了桩与土界面的进一步接触，加速了桩的热扩散。