Analysis of the Irreversible Strain of an Underwater Shield Tunnel Based on SHM Data

IF 4.6 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Wei Ye, Jian-Ping Yang, Wei-Zhong Chen, Yu-Xuan Wang
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Abstract

Deterioration evaluation of tunnel structures is the prerequisite for the tunnel’s daily traffic safety management, maintenance planning, and service life prediction. Previous studies primarily rely on material degradation tests and theoretical analysis, often lacking the support of long-term field monitoring data. This study aims to address this gap by implementing a structural health monitoring system including 48 strain gauges installed in an underwater shield tunnel in 2013. More than 8 years of data were obtained, and an irreversible strain-based evaluation framework was proposed. This framework operates in two steps: first, it separates the irreversible strain and its damage-induced part from the total strain. Second, it assesses the segments’ damage status using the hypothesis test method. Results show that the mean irreversible strain of 41 monitoring points is 43 με over 8 years, agreeing well with the predictions based on the concrete shrinkage and creep theory. It is also found that the irreversible strain and elastic strain at different monitoring points vary significantly but they are highly correlated. Quantitative results from the hypothesis test show that the irreversible strain is induced mainly by the concrete shrinkage and creep, rather than segment damage. This study provides a method for early-stage performance diagnosis of the tunnel segment during its service life.

Abstract Image

基于 SHM 数据的水下盾构隧道不可逆应变分析
隧道结构的退化评估是隧道日常交通安全管理、维护规划和使用寿命预测的前提。以往的研究主要依靠材料退化测试和理论分析,往往缺乏长期现场监测数据的支持。本研究旨在通过实施结构健康监测系统(包括 2013 年安装在水下盾构隧道中的 48 个应变片)来弥补这一不足。研究获得了超过 8 年的数据,并提出了基于应变的不可逆评估框架。该框架分为两个步骤:首先,从总应变中分离出不可逆应变及其损害引起的部分。其次,使用假设检验方法评估区段的损坏状态。结果表明,41 个监测点 8 年的平均不可逆应变为 43 με,与基于混凝土收缩和徐变理论的预测结果吻合。研究还发现,不同监测点的不可逆应变和弹性应变变化很大,但二者高度相关。假设检验的定量结果表明,不可逆应变主要是由混凝土收缩和徐变引起的,而不是分段破坏。这项研究提供了一种方法,可在隧道段使用寿命的早期阶段对其性能进行诊断。
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来源期刊
Structural Control & Health Monitoring
Structural Control & Health Monitoring 工程技术-工程:土木
CiteScore
9.50
自引率
13.00%
发文量
234
审稿时长
8 months
期刊介绍: The Journal Structural Control and Health Monitoring encompasses all theoretical and technological aspects of structural control, structural health monitoring theory and smart materials and structures. The journal focuses on aerospace, civil, infrastructure and mechanical engineering applications. Original contributions based on analytical, computational and experimental methods are solicited in three main areas: monitoring, control, and smart materials and structures, covering subjects such as system identification, health monitoring, health diagnostics, multi-functional materials, signal processing, sensor technology, passive, active and semi active control schemes and implementations, shape memory alloys, piezoelectrics and mechatronics. Also of interest are actuator design, dynamic systems, dynamic stability, artificial intelligence tools, data acquisition, wireless communications, measurements, MEMS/NEMS sensors for local damage detection, optical fibre sensors for health monitoring, remote control of monitoring systems, sensor-logger combinations for mobile applications, corrosion sensors, scour indicators and experimental techniques.
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