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《Chinese Journal of Geophysics》 2005-06
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An analytic solution for the three-dimensional diffraction of plane SV-waves by hemispherical canyons in a fluid-saturated porous medium half space

DONG Jun,ZHAO Cheng-Gang1 School of Civil Engineering and Architecture,Beijing Jiaotong University,Beijing 100044,China2 The fourth Survey and Design Institute,Wuhan 430063,China  
In this paper,an analytic solution for the three-dimensional scattering and diffraction of plane SV-waves by a hemispherical canyon in fluid saturated porous media half space is derived by using the Biot dynamic theory.The Fourier-Bessel series expansion technique is used to get the analytic solution for the first time.The results of surface displacement amplitudes are presented,the effects of frequency and angles of incident waves on the surface displacement amplitudes are discussed.These results are compared with those from the same situation but with an elastic one-phase medium.Based on numerical results,we conclude:(1)there is a significant difference between the previous single-phase model and the present two-phase model;(2)the normalized displacements on the free surface of alluvial valley are mainly dependent on the incident wave angles,the dimensionless frequency of the incident SV-waves;(3)with the increases of the incident angle,frequency,the displacements become more complicated;and the amplification of the displacement on the free surface of alluvial valley is more prominent than that modeled by single-phase.
【Fund】: 国家自然科学基金项目(50478062);; 北京市自然科学基金项目(8052015)资助
【CateGory Index】: P631.4;
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