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Advances in Concrete Construction Volume 11, Number 5, May 2021 , pages 375-386 DOI: https://doi.org/10.12989/acc.2021.11.5.375 |
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Structural monitoring and analyses on the stability and health of a damaged railway tunnel |
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Yiding Zhao, Junsheng Yang, Yongxing Zhang and Zhou Yi
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| Abstract | ||
| In this paper, a study of stability and health of a newly-built railway tunnel is presented. The field test was implemented to monitor the secondary lining due to the significant cracking behaviors influenced the stability and health of the tunnel structure. Surface strain gauges were installed for monitoring the status of crack openings, and the monitoring outputs demonstrated that the cracks were still in the developing stage. Additionally, adjacent tunnel and poor condition of surrounding rock were identified as the causes of the lining cracking by systematically characterizing the crack spatial distribution, tunnel site and surrounding rock conditions. Reconstruction of partial lining and reconstruction of the whole secondary lining were designed as the maintenance projects for different cracking regions based on the construction feasibility. For assessing the health conditions of the reinforced lining, embedded strain gauges were set up to continuously measure the strain and the internal force of the reconstructed structures. For the partially reconstructed lining, the outputs show the maximum tensile elongation is 0.018 mm during 227 days, which means the structure has no obvious deformation after maintenance. The one-year monitoring of fullsection was implemented in the other two completely reconstructed cross-sections by embedded strain gauge. The outputs show the reconstructed secondary lining has undertaken the pressure of surrounding rock with the time passing. According to the calculated compressive and tensile safety factors, the completely reconstructed lining has been in reliable and safe condition during the past year after reinforcement. It can conclude that the aforementioned maintenance projects can effectively ensure the stability and health of this tunnel. | ||
| Key Words | ||
| field test; secondary lining; cracks; maintenance; monitoring | ||
| Address | ||
| Yiding Zhao: College of Civil Engineering, Yancheng Institute of Technology, Xiwangdadaozhonglu 1, Yancheng 224051, China Junsheng Yang: School of Civil Engineering, Central South University, Lushan South Road 932, Changsha 410075, China Yongxing Zhang: National-Local Joint Laboratory of Engineering Technology for Long-term Performance enhancement of Bridges in Southern District, Changsha University of Science & Technology, Changsha 410114, Hunan, China; School of Civil Engineering, Nanjing Forestry University, Longpan Road 159, Nanjing 210037, China Zhou Yi: School of Civil Engineering, Southwest Jiaotong University, Xian Road 999, Chengdu 611756, China | ||
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