Fbg Sedimentation Tube Measuring Principle And Algorithm Research

In view of structural health monitoring of underground space is still mainly rely on Level, Total Station and other semi-automatic optical monitoring tools, not only complicated operation for long-distance monitoring of more cumulative error, and it is difficult to adapt to the complex monitoring environment. Lacks a long-distance monitoring and long-term automation means to ensure the safety of Metro Shield Tunnel settlement. This article is designed a long distance FBG settlement tube monitoring system for subway tunnel subsidence monitoring, solve the traditional monitoring techniques for the normal operation of the subway tunnel monitoring difficult puzzles, Put fiber grating sensor paste onto the surface of the aluminum alloy tube made a FBG settlement tube, multiple FBG settlement tube through a cannula connected to a long distance FBG settlement tube, detailed design the connection and fixed of long-distance FBG settlement tube, built a long-distance FBG settlement tube monitoring system, focus long distance FBG settlement tube measuring principle of the monitoring system, derived long distance FBG settlement tube displacement calculation method, write a MATLAB program for FBG settlement tube monitoring system, to achieve data processing and graphical results output, and FBG settlement tube finite element simulation to verify the correctness of the data calculated results. Long distance FBG settlement tube monitoring system compared to traditional monitoring techniques have a greater advantage, in line with the high demands put forward by the subway tunnel for safety monitoring technology. This subject installed a300-meter long distance FBG settlement tube to monitoring a Shanghai subway tunnel. Monitoring for several months of the settlement, the measurement results were compared with the measured results with Level, feasibility of validated fiber grating sedimentation tube tunnel subsidence measurements on. The monitoring results show that:FBG sedimentation tube monitor subway tunnel there is a better than conventional Level measurement accuracy and a smaller error, FBG settlement tube easy to automate measurement, for already the normal operation of the tunnel, FBG settlement tube is easier to implement than the traditional method of measuring.