Behavior of Saturated Remolded Loess Subjected to Coupled Change of the Magnitude and Direction of Principal Stress
Publication: International Journal of Geomechanics
Volume 23, Issue 1
Abstract
Undrained torsional shear tests were carried out on remolded loess specimens using a hollow cylinder apparatus to investigate the deformation behavior and noncoaxiality (where the direction of the plastic strain increment is not coaxial with the direction of the principal stress) of remodeled loess when the magnitude and direction of the principal stress change simultaneously. It can be found that the deformation behavior of tested samples is significantly influenced by the intermediate principal stress coefficient and the rotation range of the principal stress. The influences of elastic strain, rotation range of principal stress, intermediate principal stress coefficient, and cycle period on the noncoaxiality were also studied. Analysis of the test results demonstrate obvious noncoaxiality of the remolded loess. The noncoaxiality shows segmentation characteristics. The noncoaxiality will be overestimated if the elastic strain is considered and is negative when the principal stress rotates in the reverse direction. Reversal of the principal stress leads to abrupt changes in noncoaxiality. However, the noncoaxiality is similar in the process of forward rotation and reverse rotation of the principal stress. With the same cycle period, the noncoaxiality angle decreases with an increase in intermediate principal stress coefficient, but the effect of intermediate principal stress coefficient decreases with an increase in the cycle period. Increases in the cycle period increase the noncoaxiality of the remolded loess, while the influence of the rotation range of the principal stress on the noncoaxiality is not significant.
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Acknowledgments
The authors would like to acknowledge the financial support of the National Natural Science Foundation of China (Grant Number U1934213), the Natural Science Basic Research Program of Shaanxi (Grant Number 2019JM-216), a fellowship from the China Postdoctoral Science Foundation (number 2020M673320), and the Fundamental Research Funds for the Central Universities, CHD (Grant Number 300102210308).
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Information & Authors
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Published In
International Journal of Geomechanics
Volume 23 • Issue 1 • January 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jul 27, 2021
Accepted: Jul 27, 2022
Published online: Oct 21, 2022
Published in print: Jan 1, 2023
Discussion open until: Mar 21, 2023
ASCE Technical Topics:
- Continuum mechanics
- Coupling
- Deformation (mechanics)
- Dynamics (solid mechanics)
- Elastic analysis
- Engineering fundamentals
- Engineering mechanics
- Laboratory tests
- Loess
- Material mechanics
- Materials engineering
- Motion (dynamics)
- River engineering
- Rotation
- Sediment
- Shear stress
- Shear tests
- Solid mechanics
- Strain
- Stress (by type)
- Structural analysis
- Structural engineering
- Structural mechanics
- Structural members
- Structural systems
- Tests (by type)
- Water and water resources
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