Wave dispersion in granular soil by DEM analysis in two and three dimensions

C. N. Thomas, G. Mylonakis, S. Papargyri-Beskoy

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

Numerical studies are conducted to investigate the existence of wave dispersion in resonant column tests on dry granular soil. The distinct element method (DEM) in the time domain is employed in two and three-dimensions to simulate the laboratory apparatus. The investigations focus on the effect of sample width, voids ratio. viscous damping and wavelength, on propagation velocities of longitudinal harmonic waves in rectangular samples consisting of uniform grains. It is shown that granular materials may exhibit anomalous dispersion that is, wave velocities that increase with increasing excitation frequency. This increase may be significant for squatty samples, yet becomes less pronounced for slender samples. The dispersion effects tend to be more pronounced in 2D over 3D analyses which suggests waveguide dispersion. Similar findings have been reported in some experiments on granular materials, but have not been systematically explored by numerical means. Results are presented in the form of dimensionless graphs and charts that elucidate the salient features of the problem.

Original languageEnglish
Title of host publicationProceedings of the 9th International Workshop on Mathematical Methods in Scattering Theory and Biomedical Engineering: Advanced Topics in Scattering and Biomedical Engineering
PublisherWorld Scientific Publishing Co.
Pages218-225
Number of pages8
ISBN (Print)9814322024, 9789814322027
Publication statusPublished - 1 Jan 2010
Event2009 9th International Workshop on Mathematical Methods in Scattering Theory and Biomedical Engineering - Patras, United Kingdom
Duration: 9 Oct 200911 Oct 2009

Conference

Conference2009 9th International Workshop on Mathematical Methods in Scattering Theory and Biomedical Engineering
CountryUnited Kingdom
CityPatras
Period9/10/0911/10/09

Keywords

  • Distinct element method
  • Numerical analyses
  • Wave dispersion

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    Thomas, C. N., Mylonakis, G., & Papargyri-Beskoy, S. (2010). Wave dispersion in granular soil by DEM analysis in two and three dimensions. In Proceedings of the 9th International Workshop on Mathematical Methods in Scattering Theory and Biomedical Engineering: Advanced Topics in Scattering and Biomedical Engineering (pp. 218-225). World Scientific Publishing Co..