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International Journal of

Recent Trends in Engineering

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International Journal of Recent Trends in Engineering (IJRTE)

ISSN 1797-9617

Volume 1,  Number 6,  May 2009

Issue on Civil Engineering

Page(s): 30-35

Numerical and Analytical Solutions for Ovaling Deformation in Circular Tunnels Under Seismic Loading

           Ahmad Fahimifar, Arash Vakilzadeh

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Ovaling deformations develop when waves propagate perpendicular to the tunnel axis. Two analytical solutions are used for estimating the ovaling deformations and forces in circular tunnels due to soil–structure interaction under seismic loading. In this paper, these two closed form solutions will be described briefly, and then a comparison between these methods will be made by changing the ground parameters. Differences between the results of these two methods in calculating the magnitudes of thrust on tunnel lining are significant. For verifying the results of these two closed form solutions, numerical analyses were performed using finite element code (ABAQUS program). These analyses show that the two closed form solutions provide the same results only for full-slip condition.

Index Terms

Seismic analyses, ovaling deformation, circular tunnel, soil-structure

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