基于分布式光纤的尾砂浸润线位置监控试验研究

Experimental Research on Monitoring Phreatic Line in Tailings Based on Distributed Optical Fiber Temperature Sensing Technology

坝体浸润线是尾矿坝的生命线,及时准确监控在役尾矿坝浸润线位置的实时变化,对保证尾矿库安全运行意义重大。建立基于分布式光纤测温技术的尾砂浸润线监测物理模型试验系统,探讨了分布式光纤测温技术监控尾砂浸润线的量测方法,重点分析了5A、10A、15A三种加热电流作用下尾砂浸润线稳定、下降和上升时分布式光纤温差的变化规律。试验结果表明:选定合适大小电流加热的分布式光纤测温技术可及时准确捕捉尾砂浸润线位置的实时变化,是一种有实用的尾矿坝浸润线监测方法。

It is very significant for safety of tailings pond in operation by monitoring the phreatic line of tailings dam quickly and precisely.Firstly, the physical experiment model system for measuring phreatic line of tailings by distributed optical fiber temperature sensing technology（DOFTST） is set up.Then the measuring method for monitoring the phreatic line is discussed with DOFTST,and the variation law of temperature difference for optical fiber in tailings is studied when the phreatic line keeps stable and unstable separately under three different heating electric current：5A,10 A,15A.The experiment results show that the accurate position of the phreatic line is measured quickly by DOFTST with suitable heating electric current, and that DOFTST is a promising approach of monitoring phreatic line in tailings dam.