Eighth International Conference on Case Histories in Geotechnical Engineering
Frequency Effects on Low-Strain Shear Modulus and Damping for Natural Clays and Silts
Publication: Geo-Congress 2019: Geotechnical Materials, Modeling, and Testing (GSP 310)
ABSTRACT
This study examines frequency effects on low-strain shear modulus and damping for 12 clayey and silty soil samples. A series of torsional shear tests were performed at frequencies ranging from 0.001 and 5 Hz. Soil samples with a range of plasticity were tested and results were normalized with the results measured at a frequency of 0.5 Hz. With a few exceptions, the shear modulus is lower at very low frequency ranging from 0.001 to 0.05 Hz, then become constant at frequencies ranging from 0.05 to 1 Hz, and increases as the frequency increases to 5 Hz. The damping measured at 0.001 Hz was found to be 2 times higher than the damping measured at 0.5 Hz. Similar to the shear modulus results, the damping is relatively constant at frequencies ranging from 0.05 to 1 Hz and increases as the frequency increases up to 5 Hz. Overall results show that frequency effects are more pronounced for high plasticity soils especially at low frequencies.
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ACKNOWLEDGEMENT
This work is partially supported by the South Carolina Department of Transportation and Federal Highway Administration. The authors are grateful for the funding that allows collecting many high quality soil samples for this research.
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Information & Authors
Information
Published In
Geo-Congress 2019: Geotechnical Materials, Modeling, and Testing (GSP 310)
Pages: 590 - 598
Editors: Christopher L. Meehan, Ph.D., University of Delaware, Sanjeev Kumar, Ph.D., Southern Illinois University Carbondale, Miguel A. Pando, Ph.D., University of North Carolina Charlotte, and Joseph T. Coe, Ph.D., Temple University
ISBN (Online): 978-0-7844-8212-4
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Mar 21, 2019
ASCE Technical Topics:
- Clays
- Continuum mechanics
- Damping
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Geomechanics
- Geotechnical engineering
- Laboratory tests
- Material mechanics
- Material properties
- Materials engineering
- Mechanical properties
- Motion (dynamics)
- Natural frequency
- Oscillations
- Shear modulus
- Shear tests
- Silt
- Soil mechanics
- Soil modulus
- Soil properties
- Soils (by type)
- Solid mechanics
- Strain
- Structural dynamics
- Tests (by type)
Authors
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