境界要素法による半無限弾性体における二次元波動場の解析

抄録

An alternative method for calculating the two-dimensional scattering of P, SV and SH waves by near-surface inhomogeneities is presented. As problems are classified into the elastodynamic problems in a half-space, the BEM formulation based on a fundamental solution in a half-space is usually employed. A fundamental solution of the SH wave field in a half-space is obtained with no difficulty, but the problem of the P and SV wave fields in a half-space is of complicated nature.
In the present paper, we replace an infinite stress-free surface in a half-space by a trancated boundary of finite length and propose a method to apply the fundamental solution in an infinite space to the problems in a half-space. On the basis of the indirect boundary element method formulation, the feasibility of the method presented is investigated by solving several problems of P, SV and SH wave fields.