Interaction of a lined tunnel with the surrounding non-linear ground due to a vertical shear wave

Abstract eng:
When analysing the effects of seismic actions on lined tunnels, a non-linear soil model able to reproduce the main features of cyclic behaviour, such as damping and pore pressure generation, should be used. In this work, a horizontal shear wave propagating upwards corresponding to a constant amplitude spectral acceleration in a bandwidth limited frequency domain interacts with a lined tunnel, excavated in saturated overconsolidated hard clay. Initial values of the model’s internal variables consistent with an overconsolidated initial stress field including the tunnel’s construction effect are considered. Different amplitudes of the input signal are applied. Both a bounding surface “bubble” model, proposed by Kavvadas and Belokas [1] for structured overconsolidated soils with anisotropy, and a hysteretic model included in the software FLAC are used for the soil.

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