Impacts of Initial Deviator Stress and Cyclic Confining Pressure on Mechanical Behaviors of Ningbo Clay under Cyclic Loading
Publication: International Journal of Geomechanics
Volume 21, Issue 4
Abstract
The development of both accumulated axial strain and excess pore-water pressure under cyclic triaxial tests with and without cyclic confining pressure was the focus of the investigation. The effects of factors, such as initial deviator stress, and cyclic confining pressure, were studied. The test results indicated that, compared with the results of cyclic triaxial tests with constant confining pressure, the accumulated axial strain decreased by 19.4% and 23.8% when the slopes of the stress path were 1.0 and 1.5, respectively. The cyclic confining pressure limited the deformation of soils in cyclic triaxial tests with variable confining pressures. Additionally, the development of accumulated axial strain was significantly influenced by initial deviator stress. The accumulated axial strain ratio of initial deviator stress to without initial deviator stress increased from 1.958 to 3.778 as the initial deviator stress ratio increased from 0.05 to 0.125. On the other hand, the maximum excess pore-water pressure increased as the cyclic confining pressure increased, while the minimum excess pore-water pressure hardly changed. Both maximum and minimum excess pore-water pressures remained approximately constant until the initial deviator stress ratio was 1.0 and decreased when the initial deviator stress ratio exceeded 1.0. Besides that, an empirical formula for accumulated axial strain considering the effects of initial deviator stress and cyclic confining pressure was obtained.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51909259 and 52079135) and the International Partnership Program of the Chinese Academy of Sciences (Grant No. 131551KYSB20180042).
Notation
The following symbols are used in this paper:
- A, B, a, b, c
- fitting parameters;
- N
- number of cycles;
- pampl
- amplitude of the cyclic mean principle total stress (kPa);
- initial effective mean principal stress (kPa);
- q
- cyclic deviator stress (kPa);
- qampl
- amplitude of the cyclic deviator stress (kPa);
- qs
- initial deviator stress (kPa);
- u
- excess pore-water pressure (kPa);
- umax
- maximum excess pore-water pressure (kPa);
- umin
- minimum excess pore-water pressure (kPa);
- ɛp
- accumulated axial strain (%);
- ɛp,CCP
- accumulated axial strain under CCP tests (%);
- ɛp,VCP
- accumulated axial strain under VCP tests (%);
- η
- the slope of the stress path;
- ηs
- initial deviator stress ratio;
- amplitude of the cyclic axial total stress (kPa); and
- amplitude of the cyclic confining pressure (kPa).
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Published In
International Journal of Geomechanics
Volume 21 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Apr 30, 2020
Accepted: Oct 23, 2020
Published online: Jan 20, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 20, 2021
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