Assessment of elastic wave velocities through granular soils during monotonic loading

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Abstract

The precise estimation of the wave velocities and stiffness of geomaterials is essential for the accurate design of structures as well as reliable geotechnical characterization of sediments. In the present study, disk-shaped piezo-ceramic transducers are utilized to determine shear wave and compression wave velocities at both isotropic and anisotropic stress states. Silica sand specimens were first isotropically consolidated to confining pressure of 100 kPa and elastic wave velocities were measured at different excitation frequencies. Samples were then monotonically sheared at a low strain rate while keeping the cell pressure constant, and wave measurements were performed at various strain levels during the shearing process. It is observed that wave velocities of specimens prepared at different void ratios tend to converge at a large axial strain similar to the stress-strain relationship. The increment of normal stress component has a significant influence on compression wave velocity as compared to shear wave velocity.

Original languageEnglish
Title of host publicationProceedings of the 16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019
Publication statusPublished - 2020
Externally publishedYes
EventAsian Regional Conference on Soil Mechanics and Geotechnical Engineering 2019 - Taipei, Taiwan
Duration: 14 Oct 201918 Oct 2019
Conference number: 16th
http://www.16arc.org/About16thARC.html

Conference

ConferenceAsian Regional Conference on Soil Mechanics and Geotechnical Engineering 2019
Abbreviated titleARC 2019
CountryTaiwan
CityTaipei
Period14/10/1918/10/19
Internet address

Keywords

  • Disk transducers
  • Poisson's ratio
  • Silica sand
  • Stress anisotropy
  • Wave measurement

Cite this

Dutta, T. T., & Otsubo, M. (2020). Assessment of elastic wave velocities through granular soils during monotonic loading. In Proceedings of the 16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019