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分布式光纤测温系统因其造价低、可实现实时快速分布式测温等优点,在堤坝渗漏监测方面具有良好的应用前景。但由于缺乏必要的理论基础和试验研究,目前分布式光纤测温的应用仅局限于渗漏定性分析,缺乏定量计算研究。根据分布式光纤温度监测系统在不加热和加热两种情况下的温度测量值,利用热平衡理论及坝体周围岩土体温度变化与集中渗漏流速关系建立数学物理模型,在层流和紊流两种不同流态下探讨了渗漏流速的确定方法。经过一个实例计算,验证了所推导公式的正确性,为分布式光纤测温在渗漏监测中的应用,提供了一个定量分析的依据。
Distributed optical fiber temperature measurement system because of its low cost, rapid real-time temperature distribution can be achieved, etc., in leaking dam monitoring has a good prospect. However, due to the lack of necessary theoretical basis and experimental research, the application of distributed optical fiber temperature measurement is limited to qualitative analysis of leaks and lack of quantitative calculation. According to the temperature measurement of the distributed optical fiber temperature monitoring system under both unheated and heated conditions, the mathematical physics model is established based on the thermal equilibrium theory and the relationship between the temperature change of the rock and soil mass around the dam and the concentrated seepage flow rate. The laminar and turbulent flow Two different flow regimes were discussed to determine the leakage flow rate. After an example calculation, the correctness of the derived formulas is verified, which provides a basis for quantitative analysis for the application of distributed optical fiber temperature measurement in seepage monitoring.