2.5D Ground Motion Effects from Excitation of Underground Tunnels by Obliquely Incident Seismic Waves
Publication: Lifelines 2022
ABSTRACT
In densely populated urban areas, the presence of underground tunnels may modify the input motion for the seismic design of the aboveground structures. However, neither building codes nor seismic zonation guidelines have yet considered this matter. In this paper, the effects of an underground tunnel on the ground motion are numerically investigated, in terms of the peak ground acceleration and acceleration response spectrum. Compared with existing related studies, this paper goes further, considering obliquely incident seismic waves. The results indicate that the underground tunnel influences both the magnitude and distribution of the ground accelerations. The amplification of the peak ground accelerations due to the presence of the underground tunnel can be significant, and the amplification factors are functions of the incident angle of seismic waves.
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Lifelines 2022
Pages: 66 - 79
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Published online: Nov 16, 2022
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