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Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation.

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Title: Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation.
Authors: Han, Heming1,2 (AUTHOR) hanheming@smail.nju.edu.cn, Shi, Bin1 (AUTHOR) shibin@nju.edu.cn, Yang, Yaowen1,2 (AUTHOR) cywyang@ntu.edu.sg, Zhang, Cheng-Cheng1 (AUTHOR) zhang@nju.edu.cn, Zhang, Lei3 (AUTHOR) thuzhangl@tsinghua.edu.cn, Wei, Guangqing4 (AUTHOR) wgq@nzsensing.com
Source: Engineering Geology. May2023, Vol. 317, pN.PAG-N.PAG. 1p.
Subjects: Plastic analysis (Engineering), Fiber Bragg gratings, Boreholes, Excavation (Civil engineering), Material plasticity, Diaphragm walls
Geographic Terms: Shanghai (China)
Abstract: Deformation caused by supported excavation makes significant impact on foundation pit stability. Evaluation of potential plastic zone is crucial for early warning of foundation pit instability. To address the shortcomings of existing evaluation methods, a new identification method based on the ultra-weak fiber Bragg grating (UWFBG) technology was proposed. To validate this approach, a UWFBG monitoring program was implemented in the boreholes as part of the Shanghai Metro Line 18 project. The monitoring results were utilized to determine the range of plastic zone for each borehole. It was noted that there are two plastic deformation zones formed with different mechanisms, one located near the base of the diaphragm wall (DW) and the other is distributed within the range of 6–19 m below the excavation face. Lastly, a criterion of early warning of foundation pit instability was presented. By analyzing the monitoring data, the highest risk level of this project was determined as "Attention", implying the necessity of taking measures to prevent the local plastic zone from evolving into a full-scale sliding surface. • The identification method of soil plastic zone based on UWFBG was proposed. • Three monitoring boreholes using the UWFBG cable were established • Plastic zone caused by supported excavation was successfully identified • A criterion for early warning of foundation pit instability was proposed [ABSTRACT FROM AUTHOR]
Copyright of Engineering Geology is the property of Elsevier B.V. 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
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Header DbId: egs
DbLabel: Engineering Source
An: 163512773
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation.
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  Data: <searchLink fieldCode="AR" term="%22Han%2C+Heming%22">Han, Heming</searchLink><relatesTo>1,2</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="%22Yang%2C+Yaowen%22">Yang, Yaowen</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> cywyang@ntu.edu.sg</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Cheng-Cheng%22">Zhang, Cheng-Cheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> zhang@nju.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Lei%22">Zhang, Lei</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> thuzhangl@tsinghua.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wei%2C+Guangqing%22">Wei, Guangqing</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> wgq@nzsensing.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Engineering+Geology%22">Engineering Geology</searchLink>. May2023, Vol. 317, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Plastic+analysis+%28Engineering%29%22">Plastic analysis (Engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Fiber+Bragg+gratings%22">Fiber Bragg gratings</searchLink><br /><searchLink fieldCode="DE" term="%22Boreholes%22">Boreholes</searchLink><br /><searchLink fieldCode="DE" term="%22Excavation+%28Civil+engineering%29%22">Excavation (Civil engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Material+plasticity%22">Material plasticity</searchLink><br /><searchLink fieldCode="DE" term="%22Diaphragm+walls%22">Diaphragm walls</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Shanghai+%28China%29%22">Shanghai (China)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Deformation caused by supported excavation makes significant impact on foundation pit stability. Evaluation of potential plastic zone is crucial for early warning of foundation pit instability. To address the shortcomings of existing evaluation methods, a new identification method based on the ultra-weak fiber Bragg grating (UWFBG) technology was proposed. To validate this approach, a UWFBG monitoring program was implemented in the boreholes as part of the Shanghai Metro Line 18 project. The monitoring results were utilized to determine the range of plastic zone for each borehole. It was noted that there are two plastic deformation zones formed with different mechanisms, one located near the base of the diaphragm wall (DW) and the other is distributed within the range of 6–19 m below the excavation face. Lastly, a criterion of early warning of foundation pit instability was presented. By analyzing the monitoring data, the highest risk level of this project was determined as "Attention", implying the necessity of taking measures to prevent the local plastic zone from evolving into a full-scale sliding surface. • The identification method of soil plastic zone based on UWFBG was proposed. • Three monitoring boreholes using the UWFBG cable were established • Plastic zone caused by supported excavation was successfully identified • A criterion for early warning of foundation pit instability was proposed [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Engineering Geology is the property of Elsevier B.V. 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:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.enggeo.2023.107061
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Plastic analysis (Engineering)
        Type: general
      – SubjectFull: Fiber Bragg gratings
        Type: general
      – SubjectFull: Boreholes
        Type: general
      – SubjectFull: Excavation (Civil engineering)
        Type: general
      – SubjectFull: Material plasticity
        Type: general
      – SubjectFull: Diaphragm walls
        Type: general
      – SubjectFull: Shanghai (China)
        Type: general
    Titles:
      – TitleFull: Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Han, Heming
      – PersonEntity:
          Name:
            NameFull: Shi, Bin
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            NameFull: Yang, Yaowen
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            NameFull: Zhang, Cheng-Cheng
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            NameFull: Zhang, Lei
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            NameFull: Wei, Guangqing
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          Dates:
            – D: 01
              M: 05
              Text: May2023
              Type: published
              Y: 2023
          Identifiers:
            – Type: issn-print
              Value: 00137952
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            – Type: volume
              Value: 317
          Titles:
            – TitleFull: Engineering Geology
              Type: main
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