The Study Of Digital Processing Software And Application In Multi-channel Transient Rayleigh Wave Data

In Rayleigh wave exploration, the digital processing of data plays a very important position. This directly affects the interpretation of ground effect. Therefore, the use of accurate processing software and effective method in the Rayleigh wave exploration has important theoretical and practical significance.Rayleigh wave dispersion curve obtained by the one-dimensional phase analysis. This method requires channel spacing should be less than the effective wavelength. And minimal phase error will cause great changes in the phase velocity of Rayleigh wave. Damped least square method is a local linear model. It is easy to cause that inversion objective function can not find the global optimal solution. Therefore, the method and the technology used in the past are difficult to apply the requirements of the current Rayleigh wave exploration.This study focused on the related technologies and algorithms of F-K domain dispersion curve extraction and GA global non-linear inversion, and combined with the impact of Rayleigh wave data acquisition parameters and the characteristics. Rayleigh wave exploration data processing software design and process technology research is completed.Firstly, the article describes the theoretical basis of Rayleigh wave method. This is also part of the theoretical basis of following treatment. The theoretical proof of existence of Rayleigh wave Dispersive in layered strata.Secondly, F-K domain dispersion curve extraction tests showed that the method can overcome the one-dimensional digital processing technology deficiencies, and make full use of multi-channel Rayleigh wave data record information. GA global non-linear inversion indicated that the inversion is not easy getting into local optimal solution.Thirdly, some examples illustrate each mode Rayleigh wave dispersion curve characteristics in the X-T domain. Tests demonstrated the impact on their extraction of dispersion curves. Parameters change example (including the X-T removal window, collection order, and channel interval) shows the impact on the F-K domain energy spectrum. The shape of the H-V domain dispersion curve shows the initial inversion model setting method. Some examples presented GA inversion parameter settings. Finally, Rayleigh wave exploration data digital processing examples presented software and processing techniques, including data browsing, array parameter, dispersion curves picking, S-wave velocity inversion and profile. The results show that the software is very user-friendly, human-computer interaction and graphical capabilities. F-K domain dispersion curves extraction and the GA global non-linear inversion is very accurate.