Dynamic testing of free field response in stratified granular deposits

L. Dihoru*, S. Bhattacharya, F. Moccia, A. L. Simonelli, C. A. Taylor, G. Mylonakis

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

7 Citations (Scopus)

Abstract

The dynamic free field response of two stratified deposits with different stiffness ratios between the top and the bottom layer was analysed by shaking table testing. The granular deposits were contained in a laminar shear box and subjected to a wide set of dynamic inputs with different frequency content. Two exploratory modal testing techniques were employed to measure the natural frequency of the individual layers and the results were employed in the calculation of the fundamental period of the overall stratified profile by an extended variant of the Madera procedure [1]. The dynamic response was investigated in relation to the frequency content of the dynamic excitation, the granular material properties and the stiffness characteristics of the enclosing container. The measured dynamic stiffness for the mono-layered and the bi-layered sand deposits compare well with previous empirical curves for sands increasing the confidence in the shaking table and shear stack testing as tools of dynamic investigation of granular media.

Original languageEnglish
Pages (from-to)157-168
Number of pages12
JournalSoil Dynamics and Earthquake Engineering
Volume84
DOIs
Publication statusPublished - 6 May 2016

Keywords

  • 1-g testing
  • Laminar shear box
  • Layered soil
  • Shaking table

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