Geomechanics and Engineering

  • 제44권5호
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  • Pages.625-644
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  • 2026
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Deformation behaviors and mechanical mechanisms of large-span tunnels in sedimentary rock: insights from field monitoring and numerical modeling

  • Yun Cheng (School of Civil Engineering, Yancheng Institute of Technology) ;
  • Zhanping Song (College of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Guannan Zhou (Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering) ;
  • Zhaoyu Wang (School of Civil Engineering, Yancheng Institute of Technology) ;
  • Zhiwei Xu (School of Civil Engineering, Yancheng Institute of Technology) ;
  • Wenjun Qian (School of Civil Engineering, Yancheng Institute of Technology) ;
  • Tengtian Yang (Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering) ;
  • Yinhao Sun (Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering)
  • 투고 : 2025.02.16
  • 심사 : 2026.03.05
  • 발행 : 2026.03.10
⟨ 이전 논문 다음 논문 ⟩

초록

Under train-induced disturbances, sedimentary rocks at the tunnel floor heave causes inverted arch cracking and track deformation. However, no consensus has yet been reached regarding the causes of floor heave. This paper presented a case study of GZ tunnel, in which the uplift deformation of the inverted arch was investigated through on-site inspection, deformation monitoring, and 3D numerical simulation. The deformation characteristics and underlying mechanisms were analyzed, and the original invert was subsequently reconstructed using a renovation scheme involving steel cushion beam hanging rails and transitional speed restrictions. The evolution of contact stress between the inverted arch and bedrock, as well as the deformation of the tunnel vault and inverted arch settlement, were systematically examined. The proposed remediation involved deepening the original invert structure by 1.56 m, which proved effective in mitigating and suppressing uplift deformation. The performance and applicability of the reconstructed invert were evaluated by analyzing the contact stress evolution, vault deformation, and settlement behavior based on field monitoring data and numerical modeling. The contact stress exhibited a gradual increase followed by convergence, with final values of 155.09 kPa, 167.57 kPa, and 221.69 kPa at the monitored sections. No abrupt stress changes were observed over 30 to 55 days, indicating a stable stress state. The average uplift displacement of the inverted arch surface was reduced by 73.17% compared with pre-reconstruction conditions, indicating that the reconstructed invert exhibited stable structural adaptability and effectively controlled both vault settlement and arch uplift.

키워드

과제정보

The authors thank the Jiangsu Province Young Science and Technology Talent Support Project (JSTJ-2025-319), Basic Science Research Project of Higher Education Institutions in Jiangsu (24KJB560024), High-level Talent Research Project from Yancheng Institute of Technology (xjr2023019), Key R&D Program of the Tibet Department of Science and Technology (CGZH2025000524), General Program of Jiangsu Province Natural Science Foundation (BK20251935).

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