Based On The Generalized Inverse Algorithm For Layered Elastic Medium Rayleigh Wave Inversion,

Be different from the P wave and S wave in the layered medium, the Rayleigh surface wave (R wave) has the characteristic of frequency-dispersion, and is precisely this characteristic enables it to be able to the application of engineering geological exploration and engineering quality testing. It is a topic in the fields of the seismic exploration and geo-technical engineer to inverse the properties of the stratified in half space by using the Rayleigh waves. Inversion problem is the hard core in the geophysics, which is recurring to forward modeling and using the observational data to inverting the strata structure and the velocity parameter. Through the introduction and quite existing linear and the misalignment inversion method, this article proposes that the generalized counter algorithm inversion will apply in the surface wave inversion the thought.This article first separately discusses the isotropic medium, the even half space medium and the stratified medium, and analyzes the Rayleigh surface wave's frequency dispersion characteristic. Then in view of several present inversion surface wave frequency dispersion curve commonly used inversion method: Least squares method (LSM), genetic algorithm (GA), simulation annealing (SA) and so on, compared with these method good and bad points and inversion effect. This paperintroduces one kind of linear inversion method------generalized counteralgorithm, used the scalar transmission algorithm to carry on the numerical calculus simulation to obtain the frequency dispersion curve., and carried on the programming to come true the Rayleigh surface wave inversion simulation. Compares with the least squares method inversion, this method has the convergence rate quick and the stable merit. The paper uses theτ-p transformation to purify surface wave depuration and the conventional Fourier transformation to pick up the frequency dispersion curve, does inversion about roadbed underground speed structure by the Heng-Shao highway's Transient surface wave exploration data, and actualizes the surface wave inversion flow completely in the actual exploration.Generally speaking, the Rayleigh surface wave's inversion research is in the surface wave exploration domain the very important research subject. The inversion explained that the method choice affects the accuracy of the underground medium nature and the parameter, and also directly has a relationship with precision of surface wave exploration. As a result of the underground medium's complexity, we can develop the complex stratum medium inversion method research further.