Surface Motion of an Earth Dam on Layered Half-Space for Incident Plane SH Waves

Abstract eng:
Surface motion of an earth dam with a core wall on layered half-space for incident plane SH waves is presented by indirect boundary element method (IBEM). The free-field response is calculated for the surface displacements, the displacements and stresses at the interface between the dam and the layered half-space. The fictitious distributed loads are applied on the interface and the surface of the dam to calculate the Green’s functions for the surface displacements of the half-space, the displacements and stresses at the interface, and the displacements and stresses at the surface of the dam. The amplitudes of the fictitious distributed loads are determined by the boundary conditions. The surface motions due to the free field and due to the fictitious distributed loads are added to obtain the whole solution. The numerical results are performed for an earth dam with a core wall on one single soil layer over half-space, and the effects of incident frequency and angle, height of dam, thickness of soil layer, and stiffness ratio among the core wall, the dam, the soil layer, and the bedrock, etc. on the surface motion are discussed. It is shown that the surface motion depend on both the scattering of incident waves by the dam and the resonance characteristics of layered half-space, and there are interaction between the scattering of waves by the dam and the dynamic characteristics of layered half-space.

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