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Deep displacement monitoring and foundation base boundary reconstruction analysis of diaphragm wall based on ultra-weak FBG.

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Title: Deep displacement monitoring and foundation base boundary reconstruction analysis of diaphragm wall based on ultra-weak FBG.
Authors: Han, Heming1 (AUTHOR) hanheming@smail.nju.edu.cn, Shi, Bin1 (AUTHOR) shibin@nju.edu.cn, Zhang, Lei1,2 (AUTHOR) njuzhangl@163.com, Chen, Qin1 (AUTHOR) 15150682052@163.com, Wang, Chengrong3 (AUTHOR) 916567894@qq.com, Ding, Lihong3 (AUTHOR) 95894525@qq.com, Wang, Rulu4 (AUTHOR) WRL62@live.cn
Source: Tunneling & Underground Space Technology. Nov2021, Vol. 117, pN.PAG-N.PAG. 1p.
Subjects: Diaphragm walls, Fiber Bragg gratings
Geographic Terms: Shanghai (China)
Abstract: • A method is proposed for deep displacement monitoring using ultra-weak FBG. • The state of diaphragm wall base can be determined by characteristics of ε-t curve. • The displacement of diaphragm wall with base moving is calculated by the BR model. The instability or destruction of diaphragm walls in underground engineering will cause significant economic losses and casualties. The distributed and high-precision monitoring of diaphragm wall deformation can provide reliable and detail data for disaster early-warning as well as economical design. However, recording continuous deformation of the diaphragm wall using traditional monitoring technologies remain challenging. Moreover, the basement movement of diaphragm wall is rarely considered in previous studies. In order to overcome the shortcomings of the current displacement monitoring methods and deal with the basement boundary issues, a new base boundary reconstruction (BR) was proposed and the ultra-weak Fiber Bragg grating (UWFBG) technology was adopted to monitor the displacement of the diaphragm wall. For validation, a laboratory test based on ultra-weak FBG was carried out and the feasibility of the BR method was demonstrated. Subsequently, the ultra-weak FBG and the BR method were applied to Shanghai metro line 18. The results showed that the monitoring technology and analysis method proposed in this paper can obtain detailed deformation information of the diaphragm wall in real-time, which not only provides an advanced monitoring method for the deep deformation of diaphragm wall, but also solves the deformation calculation issue with the base boundary condition changes involved. [ABSTRACT FROM AUTHOR]
Copyright of Tunneling & Underground Space Technology is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
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Header DbId: egs
DbLabel: Engineering Source
An: 152368562
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: Deep displacement monitoring and foundation base boundary reconstruction analysis of diaphragm wall based on ultra-weak FBG.
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  Data: <searchLink fieldCode="AR" term="%22Han%2C+Heming%22">Han, Heming</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hanheming@smail.nju.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Shi%2C+Bin%22">Shi, Bin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> shibin@nju.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Lei%22">Zhang, Lei</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> njuzhangl@163.com</i><br /><searchLink fieldCode="AR" term="%22Chen%2C+Qin%22">Chen, Qin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> 15150682052@163.com</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Chengrong%22">Wang, Chengrong</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> 916567894@qq.com</i><br /><searchLink fieldCode="AR" term="%22Ding%2C+Lihong%22">Ding, Lihong</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> 95894525@qq.com</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Rulu%22">Wang, Rulu</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> WRL62@live.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Tunneling+%26+Underground+Space+Technology%22">Tunneling & Underground Space Technology</searchLink>. Nov2021, Vol. 117, pN.PAG-N.PAG. 1p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Diaphragm+walls%22">Diaphragm walls</searchLink><br /><searchLink fieldCode="DE" term="%22Fiber+Bragg+gratings%22">Fiber Bragg gratings</searchLink>
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  Label: Geographic Terms
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  Data: <searchLink fieldCode="DE" term="%22Shanghai+%28China%29%22">Shanghai (China)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • A method is proposed for deep displacement monitoring using ultra-weak FBG. • The state of diaphragm wall base can be determined by characteristics of ε-t curve. • The displacement of diaphragm wall with base moving is calculated by the BR model. The instability or destruction of diaphragm walls in underground engineering will cause significant economic losses and casualties. The distributed and high-precision monitoring of diaphragm wall deformation can provide reliable and detail data for disaster early-warning as well as economical design. However, recording continuous deformation of the diaphragm wall using traditional monitoring technologies remain challenging. Moreover, the basement movement of diaphragm wall is rarely considered in previous studies. In order to overcome the shortcomings of the current displacement monitoring methods and deal with the basement boundary issues, a new base boundary reconstruction (BR) was proposed and the ultra-weak Fiber Bragg grating (UWFBG) technology was adopted to monitor the displacement of the diaphragm wall. For validation, a laboratory test based on ultra-weak FBG was carried out and the feasibility of the BR method was demonstrated. Subsequently, the ultra-weak FBG and the BR method were applied to Shanghai metro line 18. The results showed that the monitoring technology and analysis method proposed in this paper can obtain detailed deformation information of the diaphragm wall in real-time, which not only provides an advanced monitoring method for the deep deformation of diaphragm wall, but also solves the deformation calculation issue with the base boundary condition changes involved. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Tunneling & Underground Space Technology is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.tust.2021.104158
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Diaphragm walls
        Type: general
      – SubjectFull: Fiber Bragg gratings
        Type: general
      – SubjectFull: Shanghai (China)
        Type: general
    Titles:
      – TitleFull: Deep displacement monitoring and foundation base boundary reconstruction analysis of diaphragm wall based on ultra-weak FBG.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Han, Heming
      – PersonEntity:
          Name:
            NameFull: Shi, Bin
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            NameFull: Zhang, Lei
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            NameFull: Chen, Qin
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            NameFull: Wang, Chengrong
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            NameFull: Ding, Lihong
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            NameFull: Wang, Rulu
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            – D: 01
              M: 11
              Text: Nov2021
              Type: published
              Y: 2021
          Identifiers:
            – Type: issn-print
              Value: 08867798
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            – Type: volume
              Value: 117
          Titles:
            – TitleFull: Tunneling & Underground Space Technology
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