Experimental study on effects of water content on small-strain shear modulus of undisturbed loess

JIAN Tao; KONG Ling-wei; BAI Wei; WANG Jun-tao; LIU Bing-heng

doi:10.11779/CJGE2022S1029

Volume 44 Issue S1

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Chinese Journal of Geotechnical Engineering > 2022 > 44(S1): 160-165. > DOI: 10.11779/CJGE2022S1029

JIAN Tao, KONG Ling-wei, BAI Wei, WANG Jun-tao, LIU Bing-heng. Experimental study on effects of water content on small-strain shear modulus of undisturbed loess[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(S1): 160-165. DOI: 10.11779/CJGE2022S1029

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Experimental study on effects of water content on small-strain shear modulus of undisturbed loess

JIAN Tao^{1, 2,},
KONG Ling-wei^1, ,,
BAI Wei¹,
WANG Jun-tao^{1, 2},
LIU Bing-heng^{1, 2}

1.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

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Received Date: September 27, 2022
Available Online: February 06, 2023

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Abstract

The small-strain shear modulus and degradation mode of soils provide the important fundamental information for analyzing and evaluating the dynamic response of soils to earthquake in geotechnical engineering. The resonant column tests on the undisturbed loess with different water contents and confining pressures are carried out to investigate the effects of the water content and confining pressure on the small-strain shear modulus. The results show that the water content and confining pressure have significant effects on the shear modulus and degradation mode of the undisturbed loess. More specifically, udner the same water content, the shear modulus increases with an increase in the confining pressure, while an increase in the water content leads to a decrease in the shear modulus. The loess with high water content and low confining pressure shows faster shear modulus degradation. According to the test results, the correlation between the fitting parameters A and n in Hardin's equation and the water content is analyzed, based on which a modified Hardin's equation considering the water content is established to predict the maximum shear modulus G_max of the undisturbed loess.
- undisturbed loess,
- water content,
- resonant column test,
- small-strain shear modulus

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