Test Research of Seepage Monitoring Based on Distributed Optical Fiber

In this paper,a theoretical model of temperature and velocity of a fiber is derived.A test model simulating seepage indoor is designed.The optical fiber heating temperatures under different compaction degree and seepage velocities are measured through applying AC voltage on the optical fiber.The analyzing results show that the optical fiber heating temperature and seepage velocity are related in quadratic function.The quantitative relations of optical fiber temperature and seepage velocity under different soil types and compaction degree are fitted.Analysis on how the compaction degree influences the relation of optical fiber temperature and seepage velocity shows that with the increase of compaction degree,optical fiber heating temperature will gradually decline.The influence of soil type on fiber heating temperature is very complex.In practice,according to the characteristics of the soil,determining quantitative relationship and implementing quantitative monitoring of the seepage velocity are needed.