Vibration Isolation of Structures From Surface Waves in Layered Soilby Dimitri E. Beskos, Univ of Patras, Patras, Greece, Univ of Patras, Patras, Greece,
Kon L. Leung, Univ of Patras, Patras, Greece, Univ of Patras, Patras, Greece,
Ioannis G. Vardoulakis, Univ of Patras, Patras, Greece, Univ of Patras, Patras, Greece,
Abstract: This work deals with the problem of isolation of structures from ground transmitted surface waves generated by machine foundations. The isolation is accomplished by means of rectangular trenches in a passive or active manner. The problem is solved numerically in the frequency domain under conditions of plane strain by the Boundary Element Method (BEM), which treats the foundation-soil-trench system as a whole. The soil medium is assumed to be a system of layers on the top of a bedrock or an elastic half-plane. Every layer consists of a homogeneous, isotropic and linearly elastic or viscoelastic material. The formulation employs the infinite plane fundamental solution and this requires not only a discretization of the top soil surface but, in addition, a discretization along the layer interfaces. This discretization, however, is restricted for all practical purposes to a finite portion on either side of the system.
Subject Headings: Surface waves | Boundary element method | Layered soils | Equipment and machinery | Machine foundations | Elastic analysis | Vibration | Base isolation
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