基于分布式光纤感测技术的苏州盾构隧道管片变形监测分析

Monitoring and Analysis of Segment Deformation in Suzhou Shield Tunnel Based on Distributed Optical Fiber Sensing Technology

随着我国城市化进程的加快,地铁盾构隧道以其经济优势以及对城市地面交通影响小等特点,成为了解决城市道路拥堵的一个重要途径。然而,随着服役时间的增加,隧道本身会出现各种不同程度的变形破坏问题,需要及时全面监测、诊断及维护。文章阐述了分布式光纤感测技术的监测优势,详细介绍了分布式光纤感测技术在盾构隧道监测中的监测内容、监测方案。以苏州地铁2号线盾构隧道管片变形监测为例,监测结果表明:在盾构管片变形最大的施工期,盾构隧道的变形问题更多的集中在管片接缝处,管片本身的变形远小于管片接缝处变形,应变异常区域往往提示管片伸缩缝变形过大或渗漏水处。光纤传感技术在隧道监测中具有广泛的应用前景。

With the acceleration of urbanization in China,the subway shield tunnel has become an important way to solve urban road congestion due to its economic advantages and small impact on urban ground transportation.However,with the increase of service time,the tunnel itself will have various degrees of deformation and damage problems,which require timely comprehensive monitoring,diagnosis and maintenance.This paper describes the monitoring advantages of distributed optical fiber sensing technology,and introduces the monitoring content and monitoring scheme of distributed optical fiber sensing technology in shield tunnel monitoring.Taking the Suzhou Metro Line2as an example,the monitoring results show that during the construction period the deformation problem of the shield tunnel is more concentrated in the joint of the segment and the deformation of the segment itself is much smaller than the deformation at the seam of the segment.The strain anomaly area often indicates that the expansion joint of the segment is excessively deformed or leaking.Optical fiber sensing technology has broad application prospects in tunnel monitoring.