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首页> 外文期刊>Pure and Applied Geophysics >Non-intrusive Characterization of Shallow Soils and Utility Structures Below Pavements Using Rayleigh Waves
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Non-intrusive Characterization of Shallow Soils and Utility Structures Below Pavements Using Rayleigh Waves

机译：使用瑞利波的路面下面的浅层土壤和公用事业结构的非侵扰性表征

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摘要

When surface waves are used to characterize soils under a pavement, their presence causes problems during the analysis of the signals due mainly to the presence of Lamb waves and higher Rayleigh-wave modes in the signals. Recent studies have shown that these problems can be mitigated if the seismic source is placed on the surface of the soil while leaving the receivers on the pavement. However, the presence of a pavement at the surface of the soil does influence the propagation of Rayleigh waves even if it does not prevent its characterization. We show how we utilized the generalized S transform and the multi-modal analysis of surface waves to identify and separate the different Rayleigh-wave modes. Using 3D numerical models and experimental models, we show that the thickness of the pavement affects the energy distribution of the different Rayleigh-wave modes and that increasing the pavement thickness increases the chances of mode misidentification problems since the energy of the waves tend to travel on higher modes. We also demonstrate that for an underground profile of a given depth, the thickness of the soil layer has more importance than the thickness of the pavement on the Rayleigh-wave propagation energy and velocity. The influence of the pavement on the group and phase velocities of the fundamental Rayleigh-wave propagation mode is also shown to depend on their frequency (wavelength). We present two case studies at the end of the manuscript to confirm the conclusions established based on numerical and experimental models.
机译：当表面波用于在路面下的土壤表征土壤时，它们的存在在分析信号期间由于主要存在于信号中的兰姆波和较高的瑞利波模式而导致问题。最近的研究表明，如果将地震源放置在土地的表面上，则可以减轻这些问题，同时将接收器置于路面上的接收器。然而，在土壤表面处的路面的存在确实影响了瑞利波的传播，即使它不防止其表征也是如此。我们展示了我们如何利用广义的变换和表面波的多模态分析来识别和分离不同的瑞利波模式。使用3D数值模型和实验模型，我们表明路面的厚度影响了不同的瑞利波模式的能量分布，并且增加路面厚度增加了模式误识别问题的机会，因为波浪的能量倾向于行驶更高的模式。我们还表明，对于给定深度的地下轮廓，土层的厚度比瑞利波传播能量和速度的路面厚度更加重要。路面对基本瑞利波传播模式的组和相速度的影响也被认为取决于它们的频率（波长）。我们在稿件结束时提出了两项​​研究，以确认基于数值和实验模型建立的结论。

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