An Improved Equivalent Homogenous Half‐Space Method and Reverse Fitting Analysis of Rayleigh Wave Dispersion Curves

Abstract

AbstractTheoretical analysis shows that there are several values of the phase velocity to a certain frequency of Rayleigh wave on the surface of a layered medium model, which is called the multiple mode property of Rayleigh wave. The multiple mode property of surface wave results in the complication of measured dispersion curves, especially when a soft interlayer exists in strata. This brings more difficulties to the explanation of the dispersion curves measured on this kind of site. In order to facilitate engineering application, a new method, improved equivalent homogenous half‐space method, is put forward to compute the theoretical dispersion curve of a layered medium model based on the equivalent homogenous half‐space theory. This new method does not need to deal with the multiple value problem of the phase velocity, and the phase velocity resulting from this method can reflect the synthetic effect of all modes of Rayleigh waves. The inverse fitting program is compiled based on the improved equivalent homogenous half‐space method, which has gotten a very good effect in an engineering application.