水下盾构隧道运营期结构健康监测及响应规律分析  

Structural health monitoring and response analysis of an underwater shield tunnel during operation

作　　者：杨建平[1] 陈卫忠[1,2] 李明 谭旭燕 YANG Jianping;CHEN Weizhong;LI Ming;TAN Xuyan(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;Research Center of Geotechnical and Structural Engineering,Shandong University,Jinan,Shandong 250061,China;College of Civil Engineering,Fujian University of Technology,Fuzhou,Fujian 350118,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]山东大学岩土与结构工程研究中心,山东济南250061 [3]福建工程学院土木工程学院,福建福州350118

出　　处：《岩石力学与工程学报》2021年第5期902-915,共14页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(U1806226,51991392);中国科学院青年创新促进会。

摘　　要：水下盾构隧道运营期结构响应规律是结构安全性评价及异常预警的基础,健康监测系统已经成为结构响应监测与安全性评价的关键技术手段。在武汉长江隧道布设了健康监测系统,获得水下盾构隧道正常运营期(2013年9月~2020年6月)关键断面拱顶管片应变及接缝响应规律;建立多元线性回归模型和分布滞后模型,研究其用于结构异常预警的适用性;并分析环境温度、长江水位和时间效应对管片应变、纵向接缝和环向接缝张开度变化的影响规律。研究结果表明:(1)管片应变增量和接缝张开度增量不服从正态分布,其相对于正态分布具有更重的尾部,出现极值的可能性更大,分析时应避免将正常值当作异常值剔除;(2)分布滞后模型回归效果和预测效果均优于多元线性回归模型,用于预警时其对结构异常反应更为灵敏;(3)冬季温度降低,接缝张开度增大,且环缝张开度远大于纵缝张开度,分析结果解释了盾构隧道接缝冬季渗水比夏季严重、环缝渗水比纵缝严重的现象。The structural response of underwater shield tunnels during operation is the basis of structural safety evaluation and abnormality early warning. The structural health monitoring(SHM) system is already a key technology for structural response monitoring and safety evaluation. The segment strains and joint openings of typical sections of the Wuhan Yangtze River tunnel during operation period(2013.09–2020.06) are obtained by the SHM system. Both a multiple linear regression model and a distributed lag model are established and their applicability in structural abnormality warning is evaluated. Effects of three factors,including the environmental temperature,the water level of Yangtze River and the time(considered irreversible structure change),on segment strain,longitudinal joint opening and circumferential joint opening are studied by the distributed lag model. Study results show that the distributions of both the segment strain increment and the joint opening increment do not obey the normal distribution but have a fat-tail than the normal distribution,and hence,the normal values should not be eliminated as outliers in the analysis. The regression and prediction accuracies of the distributed lag model are better than those of the multiple linear regression model,and the distributed lag model is more sensitive to structural abnormalities when used for early warning. As environmental temperature decreases,the joint opening increases and the increment of the circumferential joint is much larger than that of the longitudinal joint,explaining the phenomenon that the water seepage of segment joints is more serious in winter than in summer and the water seepage of the circumferential joints is more serious than that of the longitudinal joints.

关 键 词：隧道工程 盾构隧道 健康监测 结构响应 回归 预警 

分 类 号：U45[建筑科学—桥梁与隧道工程]