用于隧道位移监测的菱形布设新方法  

New Diamond Layout Method for Tunnel Displacement Monitoring

作　　者：李文彪[1] 石义虎 刘伟浩 高云龙[1] 张聪瑞 豆海涛[1] SAMI Kakar 张忠伦 LI Wen-biao;SHI Yi-hu;LIU Wei-hao;GAO Yun-long;ZHANG Cong-rui;DOU Hai-tao;SAMI Kakar;ZHANG Zhong-lun(China Railway SiYuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Key Laboratory of Mineral Resources Processing and Environment of Hubei Province,Wuhan University of Technology,Wuhan 430070,China;CNBM Technology Innovation Academy(Shandong)Co.,LTD.,Zaozhuang 277100,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]武汉理工大学资源与环境工程学院,武汉430070 [3]武汉理工大学矿物资源加工与环境湖北省重点实验室,武汉430070 [4]中建材科创新技术研究院(山东)有限公司,枣庄277100

出　　处：《爆破》2024年第1期178-185,195,共9页Blasting

基　　金：山东省重大科技创新工程(2019JZZY020314);湖北省技术创新专项基金项目:(2022BEC040);中铁第四勘察设计院集团有限公司科研计划重点课题(2020K173);山东省无机功能材料与智能制造创新创业共同体协同创新基金(WJGTT-XT5)。

摘　　要：提出了一种基于弱光栅传感器特性的监测方法,用于长期监测运营期盾构地铁隧道中存在的不均匀沉降和管片水平错动位移。将缆状弱光栅传感器经过预拉伸后,呈菱形固定在盾构隧道的壁面,通过监测弱光栅传感器的形变量,可以判别隧道结构变形的不同模式并计算出隧道变形量,满足工程所需的实时性和精度要求。依据相似比原则,设计制造了1∶5的隧道位移模型,模拟隧道管片的局部伸缩、沉降、水平位移,将光栅传感器固定在壁面上,开展了弱光栅监测灵敏度试验、不同菱形布设角度下弱光栅监测结果对比试验和竖直沉降与水平位移试验,对比监测结果与实际位移量。研究结果表明:(1)在相同沉降情况下,弱光栅菱形布设时的光栅应变量要大于直线型布设时光栅的应变量,菱形布设方法对沉降量的变化敏感度优于传统直线型布设;(2)10°~20°为弱光栅菱形布设较优的倾斜角度区间,监测结果误差较低;(3)以光缆布设倾角为15°的试验数据为基础,建立了弱光栅波长变化与管片位移的反演方程。A monitoring method based on the characteristics of weak grating sensors is proposed for long-term monitoring of the uneven settlement and horizontal displacement of segments in shield subway tunnels during the op-eration period.The cable type weak grating sensor is fixed on the wall of the shield tunnel in a diamond patten after prestretching.By monitoring the deformation of the weak grating sensor,the tunnel deformations corresponding to dif-ferent tunnel structure modes can be distinguished and calculated to meet the real-time and precision requirements for engineering.According to the similarity ratio principle,a 1:5 tunnel displacement model is designed and manufac-tured to simulate the local expansion,settlement and horizontal displacement of the tunnel segments.The grating sen-sors are also fixed on the wall surface of the tunnel model.Sensitivity tests of the weak grating sensors are first con-ducted before displacement monitoring.Then,the weak grating monitoring results with different diamond layout angles are compared.The following step is to monitor the vertical settlement and horizontal displacement of the tunnel mod-el,which are compared with the actual displacement values.The results show that the strain of weak grating with the diamond layout is larger than that with a linear layout under the same settlement condition,which means the sensitivi-ty of the diamond layout method to settlement change is better than that of traditional linear layout.Furthermore,10°~20°is the optimal angle interval of the diamond layout for weak grating,for the monitoring result error is low.Additionally,the inversion equation of weak grating wavelength change and segment displacement is established based on the test data of diamond layout with an angle of 15°.

关 键 词：盾构管片 位移变形 弱光栅传感器 菱形布设 地铁 运营期 

分 类 号：TB22[天文地球—大地测量学与测量工程]