Open AccessEffects of Random Variations of Partially Saturated Soils Properties on Site Amplification of Seismic Ground Motions
Author(s) -
Jiangjian Xie,
Dan Li
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/455/1/012114
Subject(s) - spectral density , random vibration , standard deviation , probability density function , peak ground acceleration , soil water , seismic wave , acceleration , shear modulus , response spectrum , saturation (graph theory) , ground motion , vibration , geology , mathematics , physics , soil science , seismology , statistics , acoustics , classical mechanics , combinatorics , thermodynamics
Based on the principle of random vibration and the Tajimi-Kanai spectrum model, a seismic model with a given magnitude and epicenter distance is used to simulate the seismic motion. For the random variation of soil properties such as shear modulus, mass density, damping ratio and saturation of partially saturated soils, it is assumed that the input seismic wave is SH wave. The random dynamic response analysis of the site is conducted by using the linear wave propagation method and the Rosenblueth method, and the digital features of the amplified power spectral density function, the acceleration power spectrum density, the mean value and the standard deviation are obtained respectively. In a numerical example, a clay ground is considered. For the random variation of soil properties and the different of incident angles, the digital features of the amplified power spectral density function, the acceleration power spectral density, the mean value and the standard deviation are analyzed. The results show that the random variation of quasi saturated soils properties and the different of incident angles have great influence on the site amplification effect.