<bold>Anti-plane responses of acceleration by a shallow hill next to an alluvial valley</bold>: Fid-Bau Portal

Anti-plane responses of acceleration by a shallow hill next to an alluvial valley

Shyu, Wen-Shinn / Chou, Chuen-Shii / Lu, Chih-Wei

Abstract This study proposed a hybrid method combining finite element method (FEM) and a wave function based on the Lamb series in conjunction with modified transfinite interpolation for use in examining surface accelerations on a semi-elliptical hill subjected to shear horizontal (SH) waves of various dimensionless frequencies (η) at various incident angles (θ). The case topography included a semi-elliptical hill of fixed height adjacent to a semi-elliptical alluvial valley of variable depth (EHAV). Differences in site effects between EHAV and a single semi-elliptical hill (or a semi-elliptical alluvial valley) were investigated as a function of the modified transmissibility (TR). Variations in TR associated with η clearly revealed the resonance frequencies (RFs), associated with an elevated probability of landslides. Our simulation results revealed a larger number of RFs form in hills adjacent to AV than in isolated hill. This study proposes a systematic approach for the analysis of site effects of EHAV, focusing on the identification of potential landslides due to seismic waves excitation.

Highlights • An earthquake-induced landslide on a hill with complex surface topography was studied. • The semi-elliptical hill and alluvial valley (EHAV) was subjected to SH waves. • The proposed hybrid method with MTFI was useful to solve the scattering problems. • The transmissibility was useful to indicate the differences in displacement patterns. • This study provided a better understanding of landslide for the EHAV.