法国尼斯地区地震波放大的数值分析及与实验的比较
Numerical analysis of seismic wave amplification in Nice (France) and comparisons with experiments
摘要：
场地效应的分析是非常重要的，因为在某些特定地区，地震运动的放大作用可能非常强。在本文中，所考虑的地点位于法国里维埃拉的尼斯市中心。场地效应进行了研究，考虑数值方法（边界元法），并与实验结果（弱运动和微动）进行了比较。通过数值方法研究地震场地效应是有趣的，因为它显示了放大水平对诸如表层土壤中的波速、与深层的速度对比、地震波类型、入射和阻尼等参数的依赖性。在尼斯的这一特定区域，一维（1D）放大分析不能对最大达到水平给出令人满意的估计。然后提出了一个边界元模型，考虑不同类型的波（SH，P，SV）作为地震荷载。将冲积盆地依次假定为各向同性线弹性介质和各向同性线粘弹性固体（标准固体）。表面层的厚度、其机械性质、其一般形状以及所涉及的地震波类型对最大放大率和其发生的频率有很大影响。对于实际地震，数值结果与实验测量的每个运动分量是非常好的协议。二维盆地的影响被发现是非常强大的，并很好地再现数值。
英文摘要：
The analysis of site effects is very important since the amplification of seismic motion in some specific areas can be very strong. In this paper, the site considered is located in the centre of Nice on the French Riviera. Site effects are investigated considering a numerical approach (Boundary Element Method) and are compared to experimental results (weak motion and microtremors). The investigation of seismic site effects through numerical approaches is interesting because it shows the dependency of the amplification level on such parameters as wave velocity in surface soil layers, velocity contrast with deep layers, seismic wave type, incidence and damping. In this specific area of Nice, a one-dimensional (1D) analytical analysis of amplification does not give a satisfactory estimation of the maximum reached levels. A boundary element model is then proposed considering different wave types (SH, P, SV) as the seismic loading. The alluvial basin is successively assumed as an isotropic linear elastic medium and an isotropic linear viscoelastic solid (standard solid). The thickness of the surface layer, its mechanical properties, its general shape as well as the seismic wave type involved have a great influence on the maximum amplification and the frequency for which it occurs. For real earthquakes, the numerical results are in very good agreement with experimental measurements for each motion component. Two-dimensional basin effects are found to be very strong and are well reproduced numerically.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
