Micromechanics of seismic wave propagation in granular materials
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Published version
Author(s)
Type
Journal Article
Abstract
In this study experimental data on a model soil in a cubical cell are compared with both discrete element (DEM) simulations and continuum analyses. The experiments and simulations used point source transmitters and receivers to evaluate the shear and compression wave velocities of the samples, from which some of the elastic moduli can be deduced. Complex responses to perturbations generated by the bender/extender piezoceramic elements in the experiments were compared to those found by the controlled movement of the particles in the DEM simulations. The generally satisfactory agreement between experimental observations and DEM simulations can be seen as a validation and support the use of DEM to investigate the influence of grain interaction on wave propagation. Frequency domain analyses that considered filtering of the higher frequency components of the inserted signal, the ratio of the input and received signals in the frequency domain and sample resonance provided useful insight into the system response. Frequency domain analysis and analytical continuum solutions for cube vibration show that the testing configuration excited some, but not all, of the system’s resonant frequencies. The particle scale data available from DEM enabled analysis of the energy dissipation during propagation of the wave. Frequency domain analysis at the particle scale revealed that the higher frequency content reduces with increasing distance from the point of excitation.
Date Issued
2016-06-30
Online Publication Date
2016-06-30
2016-09-29T09:12:07Z
Date Acceptance
2015-12-26
ISSN
1434-7636
Publisher
Springer Verlag (Germany)
Journal / Book Title
Granular Matter
Volume
18
Copyright Statement
© The Author(s) 2016. This article is published with open access at Springerlink.com
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/G064954/1
Subjects
Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Mechanics
Physics, Applied
Materials Science
Physics
Wave propagation
Granular media
DEM
Laboratory test
Bender element
BENDER ELEMENT TESTS
SURFACE-ROUGHNESS
G(MAX)
SIMULATIONS
PERFORMANCE
SPECIMENS
STIFFNESS
SOLIDS
SIZE
Fluids & Plasmas
0904 Chemical Engineering
0905 Civil Engineering
0913 Mechanical Engineering
Publication Status
Published
Article Number
56