Saturation effects on ground motion of unsaturated soil layer-bedrock system excited by plane P and SV waves
Saturation effects on ground motion of unsaturated soil layer-bedrock system excited by plane P and SV waves
复制标题
平面P波和SV波激发的饱和度对非饱和土层-基岩系统地震动的影响
DOI：
10.1016/j.soildyn.2018.04.005
复制
发表时间：
2018-07
影响因子：
4
通讯作者：
Trifunac M D
中科院分区：
文献类型：
--
作者：
李伟华;郑洁;Trifunac M D
We investigate seismic ground motion in the free-field, in the unsaturated soil layer overlying bedrock. The unsaturated soil is treated as a poroelastic medium, in which the solid matrix is filled with two coupled fluids (liquid and gas). The bedrock is assumed to be a linear elastic solid. The wave fields in the unsaturated soil-bedrock system for plane P-wave and SV-wave incidence are analyzed based on the fluctuation characteristics of an unsaturated porous medium. The undetermined coefficients of the waves are evaluated and analytical solutions to seismic ground motion of an unsaturated soil-bedrock system are obtained. Numerical results on the effects of saturation on surface displacement for five casesSr= 0, 0.4, 0.8, 0.99, and 1.0), for different incident angles, wave frequencies, and soil porosity are illustrated. The results show that the existence of a gas phase in the soil has a significant effect on ground motions.
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