Shear Wave Propagation in Granular Assemblies Public Deposited

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  • Shear wave velocity is a fundamental property of a granular assembly. It is a measure of the true elastic stiffness of a bulk specimen of discrete grains. Shear wave velocity is typically measured in the laboratory (e.g., using bender elements) or in-situ (e.g., using a seismic cone penetrometer, sCPT). In the current work, shear wave propagation is modeled numerically using the discrete element method (DEM). First, an appropriate method for measuring wave velocity is identified. Then the effects of particle size and elastic properties are investigated. Specimen fabric is then quantified before and after wave excitation and the elasticity of the response at the scale of the particle contacts is investigated. The results show that shear wave velocity may be robustly measured for discrete numerical specimens. The ability to measure shear wave velocity using DEM simulations may provide another tool for researchers seeking to link results from physical and numerical experiments.
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  • Ning, Z., Khoubani, A., & Evans, T. M. (2015). Shear wave propagation in granular assemblies. Computers and Geotechnics, 69, 615-626. doi:10.1016/j.compgeo.2015.07.004
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  • The second author has received support from the Jerry Yamamuro Fellowship and the Oregon State University School of Civil and Construction Engineering. This material is based upon work supported by the National Science Foundation under Grant No. CMMI-1261563.
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