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Title:: Scattering by a Transverse Isotropic Saturated Alluvial Valley for Incident Plane qP1 Wave

作者:: 巴振宁¹; 2; 张恩玮¹; 2; 梁建文¹; 2; 吴孟桃¹; 2; (1.天津大学土木工程系,天津 300350; 2.滨海土木工程结构与安全教育部重点实验室,天津 300350)

Author(s):: BA Zhenning¹; 2; ZHANG Enwei¹; 2; LIANG Jianwen¹; 2; WU Mengtao¹; 2; (1.Department of Civil Engineering,Tianjin University,Tianjin 300350,China)(2.Key Laboratory of Coast Civil Structure Safety,Ministry of Education,Tianjin 300350,China)

Keywords:: alluvial valley; transverse isotropic saturated; plane qP1 wave; seismic wave scattering; indirect boundary element method(IBEM)

摘要:: 基于Biot流体饱和多孔介质模型,采用间接边界元方法(IBEM)在频域内求解了横观各向同性(TI)饱和沉积谷地对平面qP1波的散射问题。通过与各向同性饱和结果的对比验证了方法的正确性,开展了不同情况的数值计算分析,重点研究了沉积TI性质对地表动力响应的影响。结果表明:沉积TI性质对地表位移的幅值及其空间分布均有显著影响,且影响程度与qP1波的入射角度、入射频率和观测点位置有关。考虑沉积的TI性质可更为精确地模拟沉积谷地对平面qP1波的散射。

Abstract:: Based on Biot's theory of fluid saturated medium,the Indirect Boundary Element Method(IBEM)is used to solve the scattering problem of the plane qP1 wave from transversely isotropic(TI)saturated alluvial valley in frequency domain.The correctness of the method is verified by comparing with the results of isotropic saturated sites.Numerical calculation and analysis of different situations were carried out,with emphasis on the influence of TI properties of alluvial valley on the dynamic response of the surface.The results show that the TI properties have significant influence on the amplitude and spatial distribution of surface displacement,and the degree of influence depends on the incident angle,incident frequency and observation point location of the qP1 wave.Considering the TI properties,the scattering of the plane qP1 waves by alluvial valleys can be simulated more accurately.