Creep characteristics of lacustrine sedimentary peaty soil

RUAN Yong-fen; ZHU Shang-wang; QIAO Wen-jian; WU Long; CAI Long

doi:10.11779/CJGE2022S1030

Volume 44 Issue S1

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Chinese Journal of Geotechnical Engineering > 2022 > 44(S1): 166-171. > DOI: 10.11779/CJGE2022S1030

RUAN Yong-fen, ZHU Shang-wang, QIAO Wen-jian, WU Long, CAI Long. Creep characteristics of lacustrine sedimentary peaty soil[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(S1): 166-171. DOI: 10.11779/CJGE2022S1030

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Creep characteristics of lacustrine sedimentary peaty soil

1.
Faculty of civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China
2.
No.5 Engineering Corporation Limited of CR20, Kunming 650000, China
3.
China Railway 11th Bureau Group Urban Rail Engineering Co., Ltd., Wuhan 430074, China

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

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Abstract

Abstract

By using the SLB-1 stress-strain controlled triaxial shear permeability tester, the triaxial consolidation undrained creep tests on lacustrine sedimentary peaty soil are carried out to study its creep process under different confining pressures and partial stresses, and the creep curve under graded loading is obtained by the Chen's method. The results of the triaxial creep tests show that the strain-time relationship of the undisturbed samples exhibits obvious attenuation creep characteristics when the confining pressure is 50 and 100 kPa, while it exhibits obvious non attenuation creep characteristics when the confining pressure is 200 kPa and the deviating stress is 129 kPa. The remolded sample can bear less loads than the original one. The Chen's method is more suitable for processing the creep data than the Boltzmann's linear superposition method. Taking the creep tests under the confining pressure of 100 kPa as an example, by combining with the fitting analysis of the least square method, the generalized Kelvin model and the improved fractional Maxwell creep model are established. The obtained creep model has the characteristics of few parameters and strong applicability.
- peaty soil,
- triaxial creep,
- creep property,
- creep model

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References

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