Cracking Performance of an Operational Tunnel Lining Due to Local Construction Defects
Publication: International Journal of Geomechanics
Volume 19, Issue 4
Abstract
Local defects, such as surround cavities and insufficient thickness of the tunnel lining due to imperfect construction, will lead to local discontinuity in the ground–lining interaction. This study investigated the mechanical and cracking performance of an existing tunnel lining due to local construction defects. Field observation was carried out to detect the geometry and position of the local construction defects, whereas numerical analyses were performed to examine how these defects affected the stress distribution and cracking performance of the concrete lining. The development of cracking direction and distribution pattern on the existing tunnel lining due to the defects of local cavity and local insufficient lining thickness was demonstrated by using the extended finite-element method (XFEM). Scenarios with different construction defects were studied to account for the cracking performance at the interior and exterior sides of the existing tunnel lining. The results demonstrated that the local construction defect could lead the lining to local arch behavior, squeezing outward to the defect and consequently causing damages firstly at the invisible exterior side of the tunnel lining. The presented study demonstrated an effective way for modeling tunnel lining cracking and appropriately evaluating the actual cracking performance of the tunnel lining subject to local construction defects.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (Grant 51608539) and the National Key R&D Program of China (Grant 2016YFC0802500). The authors also appreciate the support of the China Postdoctoral Science Foundation (Grants 2016M592451 and 2017T100610) and the Fundamental Research Funds for the Central Universities of Central South University (Grant 2018zzts643).
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Published In
International Journal of Geomechanics
Volume 19 • Issue 4 • April 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Jan 22, 2018
Accepted: Sep 14, 2018
Published online: Feb 11, 2019
Published in print: Apr 1, 2019
Discussion open until: Jul 11, 2019
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