Comparative investigation on dynamic shear modulus and damping ratio of marine soils in different seas

YANG Wen-bao; CHEN Guo-xing; WU Qi; QIN You; ZHAO Kai

doi:10.11779/CJGE2020S2020

Volume 42 Issue S2

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Chinese Journal of Geotechnical Engineering > 2020 > 42(S2): 112-117. > DOI: 10.11779/CJGE2020S2020

YANG Wen-bao, CHEN Guo-xing, WU Qi, QIN You, ZHAO Kai. Comparative investigation on dynamic shear modulus and damping ratio of marine soils in different seas[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(S2): 112-117. DOI: 10.11779/CJGE2020S2020

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Comparative investigation on dynamic shear modulus and damping ratio of marine soils in different seas

YANG Wen-bao^1,,
CHEN Guo-xing^{1, 2, ,},
WU Qi¹,
QIN You¹,
ZHAO Kai^{1, 2}

1.
Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China
2.
Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing 210009, China

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Received Date: August 06, 2020
Available Online: December 07, 2022

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Abstract

Abstract

To understand the variation characteristics of dynamic shear modulus G and damping ratio $λ$ with the increasing depth H of marine soils, a series of resonant column tests are performed on silty clay with various depths taken from the three borehole profiles in Bohai Bay. The test results are compared with the strain-compatible dynamic shear modulus G and damping ratio $λ$ of marine soils in different seas and terrestrial soils cited from the published literatures. A remarkable finding of this study is that, the Bohai Bay silty clay represents the strong nonlinear and hysteresis behavior with low shear modulus and high damping, the dynamic shear modulus G and damping ratio $λ$ increase or decrease regularly with the increasing depth H. The maximum dynamic shear modulus G_max of various marine soils increases regularly with the increasing depth H. The marine soils in different seas represent more nonlinearity, hysteresis and higher small-strain damping compared with those of the terrestrial soils at the same depth H, and the correlation between the dynamic shear modulus G and the depth H of marine soils is very significant, and the proposed prediction equations for the maximum dynamic shear modulus G_max and dynamic shear modulus G based on depth H are quite universal for marine soils.
- marine soil,
- silty clay,
- dynamic shear modulus,
- damping ratio,
- soil depth,
- prediction equation

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References (15)

References

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