分布式光纤在栈桥监测中的应用分析

为解决传统监测方法在大型基坑支撑结构监测中难度大、效率低、误差大等问题,提出利用分布式传感监测技术对太原火车站调蓄池桁架支撑体系栈桥应力、应变进行监测。基于布里渊光时域反射技术(BOTDR)的测量原理和优点,设计应用一套分布式栈桥监测系统,对栈桥扰动下测试和长期变形监测。结果表明,基于BOTDR技术的栈桥分布式光纤监测系统能够准确地反映支撑体系中栈桥的变形情况,具有显著优势,可满足栈桥变形长期监测和早期安全预警。

Application Analysis of Distributed Optical Fiber in Monitoring of Trestle

In order to solve the problems of difficulty,low efficiency and large error of traditional monitoring method in the monitoring of large foundation pit support structure,a distributed sensing monitoring technology is proposed to monitor the stress and strain of trestle bridge of truss support system for storage tank of Taiyuan railway station.Based on brillouin optical time-domain reflectometer(BOTDR)measurement principle and the advantages,a set of distributed bridge monitoring system is designed to conduct the approach bridge test under the disturbance and long-term deformation monitoring and the results show that the pier distributed optical fiber monitoring system based on BOTDR can accurately reflect the deformation of the pier in the support system,has significant advantages and it can satisfy trestle long-term deformation monitoring and early safety warning.