光纤感测技术在轨道交通运营线路中的应用

为解决城市轨道交通工程在施工和后期运营过程中隧道差异沉降、结构变形、基坑渗水与失稳及周边建筑物变形等安全问题。依托宁波市轨道交通运1 号运营线,采用分布式光纤传感技术实现长距离隧道的管片变形和差异沉降监测,利用布拉格光纤光栅技术实现了隧道断面和结构变形自动化监测,结果显示监测段隧道变形较小,较为稳定。项目的成功实施,证明了光纤传感技术在轨道交通工程结构监测中的有效性,具有广泛的应用和推广价值。

Application of Optical Fiber Sensing Technology to Rail Transit Operation Lines

Problems such as differential settlement of tunnel, structural deformation, seepage and instability of foundation pits and deformation of surrounding buildings exist in the construction and later operation of urban rail transit. The distributed optical fiber sensing technology is used to realize the deformation and differential settlement monitoring of long-distance tunnel segments of Ningbo Rail Transit Operation No. 1 Tunnel; and the Bragg fiber grating technology is used to realize automatic monitoring of tunnel cross-section and structural deformation. The monitoring results show that the segment deformation is small, which proves the effectiveness of optical fiber sensing technology in the monitoring of rail transit engineering structure, which is worth popularizing.