基于拉东变换的瑞雷面波频散分析与应用

为克服面波谱分析法(SASW)提取频散曲线抗干扰能力差、不能得到多模式频散曲线等缺点,对拉东变换法进行了改进,不对原始记录进行数字处理,避免了数字处理效应的影响.通过对信号的频谱分析、结合场地的地质条件,选择频散分析的频率、速度范围,来达到规避高视速度的直达波、反射波.理论模型合成记录和实际资料的处理表明:研究的频散分析方法是有效的且适应性强,取得了较好的效果.

Dispersion analysis of Rayleigh surface waves and application based on Radon transform

To overcome the weakness of SASW method, such as, low precision and the difficulty to calculate high-mode dispersion curves, the computation of velocity dispersion with Radon transform method is improved in this paper, which does not use any digital processing of the original data and avoids the impact of digital processing like Gibbs effect. However it discriminates the direct waves and reflected waves using the frequency analysis and the geological condition of the sites to choose frequency and velocity range. It is further verified that the velocity dispersion method is valid and credible by processing synthetic surface wave record and real data, which produced good results.