基于分布式光纤传感的盾构隧道沉降监测方法研究  

Settlement Monitoring Method of Shield Tunnel Based on Distributed Optical Fiber Sensor

作　　者：武建 王涛 李波 曾强东 姚彦东 WU Jian;WANG Tao;LI Bo;ZENG Qiangdong;YAO Yandong(Research and Development Center of Transport Industry of Technologies and Equipments for Intelligent Design,Construction and Maintenance of Underwater Tunnel,China Design Group Co.Ltd.,Nanjing 210014,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]华设集团股份有限公司水下隧道智能设计、建造与养护技术与装备交通运输行业研发中心,南京210014 [2]河海大学土木与交通学院,南京210098

出　　处：《河南科学》2021年第6期943-947,共5页Henan Science

基　　金：2020年江苏省省级战略性新兴产业发展专项资金项目(苏发改高技[2020]645);扬州市建设科技计划项目(202005)。

摘　　要：沉降是表征盾构隧道结构健康、安全的重要指标,利用现有技术对其实施大规模在线监测存在困难.为此,引入分布式光纤传感技术,建立盾构隧道沉降的分布式监测方法.首先,介绍了分布式光纤传感技术,并通过竟在试验验证了其优良的应变传感性能.然后,基于共轭梁理论和分布式应变测量,建立隧道沉降的计算方法.最后,开展了室内模型试验.结果表明:本文提出的方法可准确评估盾构隧道的沉降变形,其精度可满足工程管养的需求.考虑到分布式光纤传感在传感距离、稳定性和耐久性等方面的优势,本方法具有广阔的应用前景.Settlement is an important indicator to characterize the health and safety of shield tunnel structure.However,it is difficult to implement large-scale on-line monitoring with existing technology.Therefore,a novel method is proposed based on the distributed optical fiber sensing technology to establish the settlement deformation monitoring method for shield tunnel.Firstly,the distributed fiber optic sensing technology is introduced,and its excellent strain sensing performance is verified with the static loading tests.Then,the calculation method of tunnel settlement is established based on the conjugate beam theory and distributed strain measurement.Finally,laboratory model tests were implemented to verify the proposed method.The results show that the settlement of shield tunnel can be accurately evaluated by the proposed method,and its accuracy can satisfy the requirements of engineering maintenance.With the consideration of the additional advantages of distributed fiber sensing technology,such as sensing distance,stability and durability,the proposed method present a broad application prospect.

关 键 词：盾构隧道 沉降监测 分布式光纤传感 分布式应变测量 共轭梁法 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]