Shear wave propagation in granular assemblies. (September 2015)

• Record Type: Journal Article
• Authors: Ning, Z.; Khoubani, A.; Evans, T.M.
• Is Part Of: Computers and geotechnics. Volume 69(2015)
• Page Start: 615
• Page End: 626
• Publication Date: 2015-09
• Subjects: Shear wave velocity -- Discrete element method; Engineering geology -- Data processing -- Periodicals; Soil mechanics -- Data processing -- Periodicals; Rock mechanics -- Data processing -- Periodicals; 624.1510285
• DOI: 10.1016/j.compgeo.2015.07.004
• Languages: English
• ISSNs: 0266-352X

Abstract

Abstract: 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.