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

Turn off MathJax

Article Contents

Abstract

References

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

Citation:

PDF (1522 KB)

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

More Information

Received Date: April 28, 2024

Graphical Abstract

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

FullText(HTML)

References (9)

References

[1]	GUO L, JIN H X, WANG J, et al. Undrained monotonic shear behavior of marine soft clay after long-term cyclic loading[J]. Marine Georesources & Geotechnology, 2019, 38(7): 854-866.
[2]	FENG D, ZHU X X, WANG J, et al. The effects of cyclic loading on the reconsolidation behaviours of marine sedimentary clays under intermittent drainage conditions[J]. Soil Dynam Earthq Eng, 2019, 141: 106510.
[3]	TSAI C. Generalized simple model for predicting the modulus degradation and strain accumulation of clay subject to long-term undrained cyclic loading[J]. Ocean Eng, 2022, 254: 111412. doi: 10.1016/j.oceaneng.2022.111412
[4]	QIAN J G, DU Z B, YIN Z Y. Cyclic degradation and non-coaxiality of soft clay subjected to pure rotation of principal stress directions[J]. Acta Geotechnica, 2018, 13(4): 943-59. doi: 10.1007/s11440-017-0567-8
[5]	QIAN J G, LI S Y, ZHANG J L, et al. Effects of OCR on monotonic and cyclic behavior of reconstituted Shanghai silty clay[J]. Soil Dynam Earthq Eng, 2019, 118: 111-119. doi: 10.1016/j.soildyn.2018.12.010
[6]	WICHTMANN T, NIEMUNIS A, TRIANTAFYLLIDIS T H. On the influence of the polarization and the shape of the strain loop on strain accumulation in sand under high-cyclic loading[J]. Soil Dyn Earthq Eng, 2007, 27(1): 14-28. doi: 10.1016/j.soildyn.2006.05.002
[7]	HUANG J H, CHEN J, KE W H, et al. Damping ratio evolution of saturated Ningbo clays under cyclic confining pressure[J]. Soil Dyn Earthq Eng, 2021, 143: 106581.
[8]	NIE R S, MEI H H, LENG W M, et al. Characterization of permanent deformation of fine-grained subgrade soil under intermittent loading[J]. Soil Dyn Earthq Eng, 2020, 139: 106395. doi: 10.1016/j.soildyn.2020.106395
[9]	YILDIRIM H, ERSAN H. Settlements under consecutive series of cyclic loading. Soil Dyn Earthq Eng, 2007, 27(6): 577-585. doi: 10.1016/j.soildyn.2006.10.007