隧道渗漏问题严重影响其运营安全，基于分布式光纤感测技术进行渗漏监测已成为地下空间开发利用领域的研究热点之一。文章针对常规渗漏监测技术的不足，根据基于干湿球温度计测量原理，研发了一种新型的温度敏感型隧道渗漏传感光缆，并提出基于DTS的隧道渗漏分布式感测方法，通过室内模型试验，对该隧道渗漏分布式感测方法的进行可行性验证，分析了影响感测性能的主要因素。结果表明，利用研发的温度敏感型光缆可以准确识别渗漏事件，该传感光缆经过多次风干—浸湿后，仍具有良好的可重复利用性；渗漏速度、环境风速、渗漏时长对准确识别渗漏事件的影响较小；提出了渗漏点识别的阈值标准，即当传感光缆不同测点间的相对温度降幅达到或大于0.5 ℃，且2 h内的降温速率达到或大于0.4 ℃/h时，可以判定为渗漏。

Leakage has a serious impact on the safe operation of tunnels. In recent years, the distributed optical fiber sensing (DOFS)-based leakage monitoring technology has become one of the hot topics in the field of development and utilization of underground space. In view of the deficiency of the common tunnel leakage monitoring technology, a new temperature-sensitive optical sensing cable for tunnel leakage is developed based on the principle of wet-bulb thermometer, and a DTS-based tunnel leakage distributed sensing method is proposed. The feasibility and the influencing factors of the distributed sensing method for tunnel leakage were investigated and verified through lab model tests. The results show that the developed temperature-sensitive optic sensing cable can be used to accurately identify leakage events. The sensing cable has good repeatability by the experiments of several dry-wet cycles. The influence of the leakage speed, ambient wind speed and leakage duration on the identification of leakage events is insignificant. The threshold criteria for leakage event identification is proposed, i.e. when the relative temperature drop between different sampling points of the sensing cable reaches or is greater than 0.5 ℃ , and the temperature drop rate within 2 hours reaches or is greater than 0.4 ℃ /h, it can be judged as leakage.