An Experimental Study of the Dynamic Shear Modulus and Damping Ratio of Calcareous Sand in the South China Sea

Lan, J.; K.C., D.; Hu, L., and Gao, Y., 2021. An experimental study of the dynamic shear modulus and damping ratio of calcareous sand in the South China Sea. Journal of Coastal Research, 37(5), 964–972. Coconut Creek (Florida), ISSN 0749-0208. The marine deposits in the South China Sea are character...

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Bibliographic Details
Published in:Journal of coastal research 2021-09, Vol.37 (5), p.964-972
Main Authors: Lan, Jingyan, Diwakar, K.C., Hu, Liangbo, Gao, Yangyang
Format: Article
Language:English
Subjects:
Coastal inlets
Coastal research
Confining
confining pressure
Cyclic loading
Cyclic loads
Damping
Damping ratio
Density
Dynamic characteristics
Engineering
Grain size
Mechanical properties
Pressure
Relative density
Sand
Sand & gravel
Seismic analysis
Shear modulus
Shear strain
Shear tests
Soils
Triaxial tests
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Summary:Lan, J.; K.C., D.; Hu, L., and Gao, Y., 2021. An experimental study of the dynamic shear modulus and damping ratio of calcareous sand in the South China Sea. Journal of Coastal Research, 37(5), 964–972. Coconut Creek (Florida), ISSN 0749-0208. The marine deposits in the South China Sea are characterized by an abundance of calcareous sand. The dynamic characteristics and properties of this sand are important for potential engineering seismic analysis and infrastructure development in this oil- and gas-rich region. The present study aims to investigate the dynamic shear modulus and damping ratio of typical calcareous sand in the South China Sea. A series of dynamic triaxial tests under the strain control condition of cyclic loading were conducted, with a specific focus on the effects of relative density and confining pressure. The normalized dynamic shear modulus increases with the increase in confining pressure, and the shear modulus–shear strain relationship can be adequately described with the well-known Hardin-Drnevich model. However, the influence of confining pressure tends to decline in the sand samples of high initial relative density. Overall, the variations in the damping ratio as affected by confining pressure or relative density are not very significant. The experimental results were assessed and found to be reasonably consistent with some of the previously reported results in the literature.
ISSN:0749-0208
1551-5036
DOI:10.2112/JCOASTRES-D-20-00136.1