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Research on Shield Tunnel Segment Displacement Monitoring Method Based on BOTDA Technology and Diamond-Shaped Layout
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Xuebing SUN1, Jian CHEN2, Xiaolong LI1, Liren ZHANG1
Urban Rapid Rail Transit | 2025, 38(2) : 82 - 89
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Urban Rapid Rail Transit | 2025, 38(2): 82-89
• Civil Engineering Technology •
Research on Shield Tunnel Segment Displacement Monitoring Method Based on BOTDA Technology and Diamond-Shaped Layout
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Xuebing SUN1, Jian CHEN2, Xiaolong LI1, Liren ZHANG1
Affiliations
  • 1 China Railway Siyuan Survey and Design Group Co., Ltd. Wuhan 430063
  • 2 State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics, Chinese Academy of Sciences Wuhan 430071
Published: 2025-04-01 doi: 10.3969/j.issn.1672-6073.2025.02.012
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Traditional fiber optic sensing methods mainly focus on onedimensional or twodimensional displacement monitoring of tunnel segments, making it difficult to effectively monitor threedimensional deformation between segment rings. This paper proposes a diamondshaped layout scheme based on distributed fiber optics, establishing a threedimensional deformation monitoring method suitable for shield tunnel segments. By analyzing the threedimensional deformation patterns of tunnel segments, three methods for calculating segment displacement are introduced. To validate the effectiveness of these methods, a simple and operable experimental device simulating threedimensional deformation of tunnel segments was designed, and indoor tests were conducted. The test results were compared with theoretical calculations, confirming the effectiveness of the proposed diamondshaped fiber optic layout for segment deformation monitoring, as well as the rationality of the three displacement calculation methods. The results demonstrate that the diamondshaped distributed fiber optic sensors, combined with the Kvalue decomposition method, provide optimal monitoring performance for segment displacement. The implementation of Brillouin Optical Time Domain Analysis (BOTDA) technology enables extensive realtime monitoring of tunnel segment displacement variations.

urban rail transit  /  tunnel segment  /  tunnel displacement monitoring  /  BOTDA  /  distributed fiber optic  /  diamond-shaped layout
Xuebing SUN, Jian CHEN, Xiaolong LI, Liren ZHANG. Research on Shield Tunnel Segment Displacement Monitoring Method Based on BOTDA Technology and Diamond-Shaped Layout[J]. Urban Rapid Rail Transit, 2025 , 38 (2) : 82 -89 . DOI: 10.3969/j.issn.1672-6073.2025.02.012
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Year 2025 volume 38 Issue 2
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Article Info
doi: 10.3969/j.issn.1672-6073.2025.02.012
  • Receive Date：2024-06-04
  • Online Date：2025-07-09
  • Published：2025-04-01
Article Data
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History
  • Received：2024-06-04
  • Revised：2024-11-01
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Affiliations
    1 China Railway Siyuan Survey and Design Group Co., Ltd. Wuhan 430063
    2 State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics, Chinese Academy of Sciences Wuhan 430071
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