Health-Degree Model for Stagger-Joint-Assembled Shield Tunnel Linings Based on Diametral Deformation in Soft-Soil Areas
Publication: Journal of Performance of Constructed Facilities
Volume 37, Issue 3
Abstract
In soft-soil areas, excessive transverse deformations have occurred in numerous shield tunnel linings accompanied by serious structural defects. However, to date, a method to effectively diagnose the health status of these poor-performing structures is unknown. This study focuses on health diagnosis for the typical stagger-joint-assembled shield tunnel linings in soft-soil areas of China. First, based on theoretical analyses, it is assumed that diametral deformation can be a significant indicator for the structural performance of a lining; subsequently, this is verified by abundant field data. In particular, a strong positive correlation between the diametral deformation and development of defects is observed. Subsequently, a full-scale test is performed to reveal further quantitative correlations. Besides the service limit values determined in the range of 0.24%–0.79% by specifications and prior studies, the test reveals detailed structural performance deterioration when the deformation is getting larger, where 1.5% is considered a threshold for the failure the entire structure. Additionally, the values of 0.5%, 0.8%, and 1.1% are observed to be key points indicating the gradual degradation of waterproofing, cracks, and overall mechanical performance of the lining. Based on these key points, a five-level health-degree model is constructed to determine the health status of a ring that can be regarded as a supplement of the previous limit values, which is more detailed and practical for the common large-deformed in-service linings in soft-soil areas. These findings can also serve as benchmarks for related studies on linings with different structural parameters in the future.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article
Acknowledgments
This study was supported by the Natural Science Foundation of China (Grant No. 51978523). This financial support is greatly appreciated.
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Published In
Journal of Performance of Constructed Facilities
Volume 37 • Issue 3 • June 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 3, 2021
Accepted: Jan 31, 2023
Published online: Mar 27, 2023
Published in print: Jun 1, 2023
Discussion open until: Aug 27, 2023
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