Abstract
Local cavities around the tunnel lining due to imperfect construction or ground water erosion will lead to local contact loss and discontinuity in the ground-lining interaction. This paper evaluated the effect of local cavities on the mechanical and cracking performance of an existing tunnel lining. The geometry and position of the local cavity were defined according to the results of field investigation. Numerical analyses were performed to investigate how the local cavities affect the stress state of the concrete lining and to check the stability of the tunnel. Extended Finite Element Method (XFEM) was used to illustrate the development of cracking directions and patterns on the existing tunnel lining in the vicinity of the cavity. The above results was then verified by comparing with field observations. The presented study suggested an effective way for modelling tunnel lining cracking, and shown a systematic method to preliminary evaluate the cracking performance of an existing tunneling lining with local cavities behind.
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Acknowledgements
This paper was supported by the National Key R&D Program of China (No. 2016YFC0802504) and National Natural Science Foundation of China (No. 51608539). The authors also appreciate the support of the China Postdoctoral Science Foundation (No. 2016M592451, No.2017T100610) and the Fundamental Research Funds for the Central Universities of Central South University.
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Fu, J., Xie, J., Yang, J., Wang, S., Yang, F. (2019). The Effects of Local Cavities on the Cracking Performance of an Existing Tunnel Lining. In: Cheng, WC., Yang, J., Wang, J. (eds) Tunneling in Soft Ground, Ground Conditioning and Modification Techniques. GeoChina 2018. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-319-95783-8_8
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DOI: https://doi.org/10.1007/978-3-319-95783-8_8
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