Cyclic Behavior of Saturated Clays in Plane Strain State
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 148, Issue 1
Abstract
The cyclic behaviors of soils in the plane strain state have rarely been studied in laboratory tests, while the plane strain hypothesis may have applications on the traffic-induced cyclic properties of subgrade soils beneath long road embankments. To explore the traffic-induced deformation behavior of saturated clays in the plane strain state, and to find its differences from that in the three-dimensional stress state, 55 one-way cyclic tests with compressive loading waveforms were carried out based on a true triaxial apparatus. In the plane strain state, the deformation of the sample in the direction of intermediate principal stress was precluded when the cyclic major principal stress was applied. In the three-dimensional stress state, the deformations were free in all directions, while a combination of major and intermediate principal stresses was cycled. A parameter of named the coefficient of cyclic intermediate principal stress was introduced to represent the relative relation between cyclic major and intermediate principal stresses. Test results show that both the permanent major principal strain and resilient modulus in the plane strain state were located between the cases of and in the three-dimensional stress state, and the differences between the two states are aggravated by both the increase of the cyclic stress ratio (CSR) and overconsolidation ratio (OCR). The cyclic behavior of saturated clays in the plane strain state is strongly related to the evolution of , which is increased by the increase of both the CSR and OCR and may have an upper boundary if the OCR and CSR get large enough. In addition, the shakedown behavior of saturated clays in the plane strain state is analyzed, and the boundary cyclic stress level separating the unstable and metastable ranges is determined.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by the Key Research and Development Project of Chinese Ministry of Science and Technology (No. 2017YFE0119500), the National Natural Science Foundation of China (Nos. 51878513 and 52008371), the Natural Science Foundation of Zhejiang Province (LQ21E080015), and the Science and Technology Research Program of Wenzhou City (No. S20180004).
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 148 • Issue 1 • January 2022
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© 2021 American Society of Civil Engineers.
History
Received: May 26, 2021
Accepted: Sep 22, 2021
Published online: Oct 21, 2021
Published in print: Jan 1, 2022
Discussion open until: Mar 21, 2022
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