A 2.5d coupled fe-be methodology for the dynamic interaction between longitudinally invariant structures and a layered halfspace

Abstract eng:
This paper presents a general 2.5D coupled finite element – boundary element methodology for the computation of the dynamic interaction between a layered soil and longitudinally invariant structures, such as railway tracks, roads, tunnels, dams, vibration isolation screens in the soil, and pipelines. The classical 2.5D finite element method is combined with a novel 2.5D boundary element method, for which a regularized 2.5D boundary integral equation is derived. The use of a regularized boundary integral equation avoids the evaluation of singular traction integrals. The 2.5D Green’s functions of a layered halfspace, computed with the direct stiffness method, are used in a boundary element method formulation. This avoids meshing of the free surface and the layer interfaces with boundary elements and effectively reduces the computational efforts and storage requirements. The proposed technique is applied to four examples: a road on the surface of a halfspace, a tunnel embedded in a layered halfspace, a dike on a halfspace and a vibration isolating screen in the soil.

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