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Layer-effect on variable seismic ground motions of SV-wave scattered by a double-stratified circular-arc crossing by layer-interface

2020,129:1:28,  Soil dynamics and Earthquake Engineering   www.liuguohuan.net     科研团队与课题研究招收与招聘

Abstract: This study is to theoretically investigate and quantify the variability of the seismic surface motions of a double-stratified half space with a circular-arc canyon by the SV wave incidence. Compared with the SH-wave induced scattering by the canyon with the single-layer (ideally homogeneous) medium, the challenge is to simultaneously satisfy the boundary conditions at the ground surface and layer-interface and deal with the relatively complex wave transmission on layer-interface. Theoretical solution for the SV-wave induced scattering by a double-stratified half space with circular-arc canyon is derived explicitly. The present method is validated by reducing the proposed solution with that in the homogenous medium. Then, an example is considered to further verify the derived results by simultaneously satisfying the continuity and zero-stress boundary conditions. The effects of the layer medium, the incident frequencies and incident angles on the ground motion of the double-stratified medium are investigated parametrically and compared with that of the homogeneous case. Results show that the derived solution is theoretically reliable and the layer-effect on the variability of the canyon ground motions is obvious.

Keywords: Double-phase media, Overlying water Multi-support seismic underground excitations,Underground power spectral density Underground response spectrum, Underground coherency function