Experimental study on coupling effects of cyclic confining pressure and intermittent cyclic loading on deformation behavior of saturated soft clay

HUANG Juehao; QIU Yuefeng; WU Jiaming; LI Yinan; CHEN Jian; FU Xiaodong

doi:10.11779/CJGE2024S10009

Volume 46 Issue S1

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Chinese Journal of Geotechnical Engineering > 2024 > 46(S1): 48-52. > DOI: 10.11779/CJGE2024S10009

HUANG Juehao, QIU Yuefeng, WU Jiaming, LI Yinan, CHEN Jian, FU Xiaodong. Experimental study on coupling effects of cyclic confining pressure and intermittent cyclic loading on deformation behavior of saturated soft clay[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S1): 48-52. DOI: 10.11779/CJGE2024S10009

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Experimental study on coupling effects of cyclic confining pressure and intermittent cyclic loading on deformation behavior of saturated soft clay

HUANG Juehao^{1, 2,},
QIU Yuefeng³,
WU Jiaming⁴,
LI Yinan^5, ,,
CHEN Jian^{1, 2},
FU Xiaodong^{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
3.
Power China Zhongnan Engineering Corporation Limited, Changsha 410014, China
4.
China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, China
5.
Editorial Department of Journal of Sichuan University (Engineering Science Edition), Sichuan University, Chengdu 610065, China

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Received Date: April 28, 2024

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Abstract

Abstract

The deformation characteristics of soft clay under intermittent cyclic loading and cyclic confining pressure are studied by conducting two types of cyclic triaxial tests, i.e., continuous cyclic loading and intermittent cyclic loading triaxial tests, and the influences of cyclic confining pressure and intermittent period on the accumulated axial strain of soft clay are analysed. The test results show that compared with the continuous cyclic loading conditions, the existence of intermittent period has a significant effect on the deformation characteristics of soft clay, and the deformation caused by the dissipation of the excess pore water pressure during the intermittent period cannot be ignored. On the other hand, with the increase of the cyclic confining pressure, the corresponding accumulated axial strain increment is small. The difference of the increment of accumulated axial strain under different cyclic confining pressures is significant during the cyclic loading period at the first loading stage, and can be ignored at the subsequent cyclic loading stage. Based on the above test results, a model for the accumulated axial strain of soft clay under intermittent cyclic loading considering the effects of cyclic confining pressure is proposed, and the predicted results are in good agreement with the measured data. The above research results can deepen the understanding of the deformation behavior of soft clay under intermittent cyclic loading.
- intermittent cyclic loading,
- soft clay,
- accumulated axial strain,
- cyclic confining pressure

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References

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