International Journal of Civil Engineering

en Applying a time-domain boundary element method for study of seismic ground response in the vicinity of embedded cylindrical cavity Seismic Geotechnique Seismic Geotechnique Research Paper Research Paper 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. Boundary element method BEM, Time domain, Embedded cavity, Two dimensional transient elastodynamic kernels,Scattering, Dynamic displacement 45 54 http://ijce.iust.ac.ir/browse.php?a_code=A-10-544-1&slc_lang=en&sid=1 H. Alielahi H.Alielahi@azu.ac.ir 180031947532846009866 180031947532846009866 No PhD Candidate, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, IRAN M. Kamalian Kamalian@iiees.ac.ir 180031947532846009867 180031947532846009867 Yes Associate Professor, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, IRAN J. Asgari Marnani j_asgari@iauctb.ac.ir 180031947532846009868 180031947532846009868 No Assistant Professor, Civil Engineering Department, Technical and Engineering Faculty, Central Tehran Branch, Islamic Azad University, Tehran, IRAN M. K. Jafari jafari@iiees.ac.ir 180031947532846009869 180031947532846009869 No Professor, Geotechnical Engineering Research Centre, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, IRAN M. Panji m.panji@srbiau.ac.ir 180031947532846009870 180031947532846009870 No PhD Candidate, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, IRAN