Evaluation of the Dynamic Response of a Multi-Layered Poroelastic Soil Through the ‘Thin Layer Method, Tlm’

Abstract eng:
In this paper, dynamic response of a multi-layered poroelastic soil is studied through a semi analytical method named “Thin Layer Method, TLM”. It is a semi-analytical method, through which the treatment of very complex problems becomes accessible without having to resort to numerical methods which have a major drawback in the presence of infinite geometries. The calculation method of the free field response of the layered soil is presented. The soil is subjected to the obliquely incident body wave. The interface stress between impervious elastic half-space and layered soil is estimated as the function of incident angle. Some poroelastic multilayered soil profile amplifications as well as a parametric study are presented in order to analyses the effect of the incidence angle, the porosity and the saturation degree on the profile response. Results show that porosity and the saturation degree variation affect mainly the horizontal amplification. This is true in the case of P1wave (fast compressional wave) incidence. When SV wave incidence is considered, both horizontal and vertical responses are influenced but this influence is less important. This is explained by the fact that only compressional waves propagate in the interstitial pores. However, the effect of the incidence angle on the site response is important for both P 1and SV wave excitation, but it's more important in the case of SV-wave than in the case of P1-wave.

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