Cyclic threshold shear strains for pore water pressure generation and stiffness degradation in marine clay

XIAO Xing; JI Dongwei; HANG Tianzhu; WU Qi; CHEN Guoxing

doi:10.11779/CJGE2023S10005

Volume 45 Issue S1

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Chinese Journal of Geotechnical Engineering > 2023 > 45(S1): 123-127. > DOI: 10.11779/CJGE2023S10005

XIAO Xing, JI Dongwei, HANG Tianzhu, WU Qi, CHEN Guoxing. Cyclic threshold shear strains for pore water pressure generation and stiffness degradation in marine clay[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(S1): 123-127. DOI: 10.11779/CJGE2023S10005

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Cyclic threshold shear strains for pore water pressure generation and stiffness degradation in marine clay

XIAO Xing^1,,
JI Dongwei¹,
HANG Tianzhu¹,
WU Qi^{1, 2, ,},
CHEN Guoxing^{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: July 05, 2023
Available Online: November 23, 2023

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Abstract

Abstract

The cyclic threshold shear strain is a fundamental property of saturated soils under cyclic loading. To investigate the cyclic threshold shear strains for pore water pressure generation (γ_tp) and stiffness degradation (γ_td), a series of strain-controlled multistage undrained cyclic triaxial tests are carried out on the in-situ saturated marine clay in the Yangtze River estuary with different values of plasticity index I_p. The test results show that both γ_tp and γ_td increase with the increasing I_p of the marine clay, and γ_tp is greater than γ_td for the same marine clay tested under the same conditions, with γ_tp = 0.018% ~ 0.019%, γ_td = 0.011% ~ 0.012% for I_p of 17, and γ_tp = 0.037% ~ 0.041%, γ_td = 0.022% ~ 0.027% for I_p of 30. Moreover, the development of stiffness degradation may not necessarily require the pore water pressure generation, but can be aggravated by it. The γ_tp and γ_td of the marine clay are compared with those of the terrestrial soils cited from the published literatures, indicating that the special marine sedimentary environment causes the γ_tp and γ_td of the marine clay in the Yangtze estuary to be smaller than those of the undisturbed terrestrial clay.
- marine clay,
- pore water pressure generation,
- stiffness degradation,
- cyclic threshold shear strain,
- cyclic triaxial test

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References

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