Abstract
Thanks to the high safety level and the high-speed rate of work, mechanized tunneling (especially TBM) has speedily spread worldwide for tunnels excavation. Lining behind TBM normally consists of precast rings each one consists of a number of segments connected together with radial and longitudinal bolts. The main items which control the stability of TBM excavation are face pressure, grout pressure and interaction of lining components with grout and surrounding soil.
Many methods have been used to study the behavior of segmental lining including empirical methods, analytical methods, and numerical modelling. The third method is currently considered one of the most commonly used methods for design check purposes. Most tunnelling codes use analytical methods to study the behavior of segmental lining. The aim of this paper is to study the shortenings of current used numerical models and try to improve it, in addition, to check the efficiency of numerical modelling compared to analytical methods. Firstly a comprehensive study will be performed to get an appropriate model for simulating segmental lining components. Consequently, a better understanding will be possible for the interaction between different segmental lining components and the annular grout. The results of the analysis will be discussed and compared to the traditional models to check the efficiency and validity of the numerical modelling technique. Finally, a study will be introduced to investigate the optimum number of bolts may be used between successive segments. This could help in optimizing the segmental lining for less cost and more safety levels.
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Acknowledgments
Authors would like to sincerely thank Dr. Ashraf Abu-krisha, the head of the technical department at National Authority for Tunnels (NAT), for his great help to provide the available field and technical data. Authors also would like to thank Dr. Ahmed Hassan (Assoc. Prof., Civil Engineering Department at Faculty of Engineering - Minia University), for his valuable comments.
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Elrehim, M.Z.A., Asaad, M. (2018). Computational and Numerical Considerations of Segmental Lining Design. In: Agaiby, S., Grasso, P. (eds) Engineering Challenges for Sustainable Underground Use. GeoMEast 2017. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-319-61636-0_3
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DOI: https://doi.org/10.1007/978-3-319-61636-0_3
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