基于分布式光纤测温系统的管廊管道渗漏监测模型试验

Experimental research on leakage monitoring model of pipe gallery based on distributed optical fiber temperature measurement system

针对埋地式管道与综合管廊管道渗漏特征的差异,提出采用分布式光纤测温技术对管廊管道进行渗漏监测。对不同环境、不同管径的管道,设计了监测系统与模型试验装置,对不同位置的渗漏特征进行监测。结果表明:对于圆形管道,光纤布置在管径截面左右两侧和正下方时能监测到发生于截面上的渗漏;管道内介质与环境的温差越大,漏点处光纤温度响应越明显;同一漏点截面处,当水自漏点沿着管壁下滑时,截面低点处温度比高点处温度略高;顺着送水方向,管道上远处漏点温度比近处漏点温度高。

In view of different leakage characteristics of integrated pipe gallery and buried pipelines,an application of distributed optical fiber temperature measurement technology was proposed to monitor the leakage of the pipe gallery.A model test device and a monitoring system were designed to monitor and study the leakage characteristics of pipes with different diameters at diffe-rent locations under different ambient temperatures.The results show that for circular pipes,when the optical fiber is arranged on the left and right sides and directly under the pipe diameter section,the leakage on the section can be effectively detected.As the temperature difference between the environment and the medium in the pipe increases,the temperature response of the optical fiber near the leakage point becomes more obvious.At the same leakage point section,when the water slides down the pipe wall from the leakage point,the temperature at the low point of the cross section is slightly higher than that at the high point.Along the water supply direction,the temperature of the distant leakage point on the pipe is higher than that of the nearby leakage point.