*In this paper, an advanced formulation of a time-domain two-dimensional boundary element method (BEM) is presented and*

*applied to calculate the response of a buried, unlined, and infinitely long cylindrical cavity with a circular cross-section subjected*

*to SV and P waves. The applicability and efficiency of the algorithm are verified with frequency-domain BEM examples of the*

*effect of cylindrical cavities on the site response analysis. The analysis results show that acceptable agreements exist between*

*results of this research and presented examples. For a shallow cavity, the numerical results demonstrate that vertically incident*

*SV wave reduces the horizontal components of the motion on the ground surface above the cavity, while it significantly increases*

*the vertical component for a dimensionless frequency (&eta) of 0.5 and h/a=1.5. The maximum values of normalized displacements*

*in vertical component of P waves are larger than horizontal component of SV waves for &eta=1.0. For a deeply embedded cavity,*

*the effect of the cavity on the surface ground motion is negligible for incident SV wave, but it increases the vertical component of*

*the displacement for incident P wave. Additionally, far and near distances from the center of the cavity show different amplitude*

*patterns of response due to the cavity effect. Increasing the distance from the center of the cavity, the amplitude of displacement*

*and the effect of the cavity attenuates significantly.*

Type of Study: Research Paper |
Subject:
Seismic Geotechnique