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| Structural health monitoring and response analysis of an underwater shield tunnel during operation |
| YANG Jianping1，CHEN Weizhong1，2，LI Ming3，TAN Xuyan1 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Research Center of Geotechnical and Structural Engineering，Shandong University，Jinan，Shandong 250061，China；3. College of Civil Engineering，Fujian University of Technology，Fuzhou，Fujian 350118，China) |
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Abstract The structural response of underwater shield tunnels during operation is the basis of structural safety evaluation and abnormality early warning. The structural health monitoring(SHM) system is already a key technology for structural response monitoring and safety evaluation. The segment strains and joint openings of typical sections of the Wuhan Yangtze River tunnel during operation period (2013.09–2020.06) are obtained by the SHM system. Both a multiple linear regression model and a distributed lag model are established and their applicability in structural abnormality warning is evaluated. Effects of three factors，including the environmental temperature，the water level of Yangtze River and the time (considered irreversible structure change)，on segment strain，longitudinal joint opening and circumferential joint opening are studied by the distributed lag model. Study results show that the distributions of both the segment strain increment and the joint opening increment do not obey the normal distribution but have a fat-tail than the normal distribution，and hence，the normal values should not be eliminated as outliers in the analysis. The regression and prediction accuracies of the distributed lag model are better than those of the multiple linear regression model，and the distributed lag model is more sensitive to structural abnormalities when used for early warning. As environmental temperature decreases，the joint opening increases and the increment of the circumferential joint is much larger than that of the longitudinal joint，explaining the phenomenon that the water seepage of segment joints is more serious in winter than in summer and the water seepage of the circumferential joints is more serious than that of the longitudinal joints.
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MAO Yuting1, 2, HE Manchao1, 2, LIU Fangzhou3, BAI Xing4, YANG Xiaojie1, 2, TAO Zhigang1, 2*. Development and application of a large-scale physical model system for tunnel creep testing[J]. , 2026, 45(6): 1627-1638. |
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2021, Vol. 40 
