Strength and Dilatancy of Overconsolidated Clays in Drained True Triaxial Tests
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 140, Issue 4
Abstract
The long-term mechanical behavior of overconsolidated (OC) clays in three-dimensional (3D) stress states plays an important role in many geotechnical problems, such as slope failures. However, previous experimental studies of OC clay were carried out under undrained conditions. This paper presents the results of a series of drained true triaxial tests on normally consolidated (NC) and OC clays. The stress paths were maintained in the same with Lode angles of . The test results show that OC clays exhibit positive dilatancy tendencies and greater shear strengths and smaller strains to failure than NC clays. The shear strength and dilatancy are largely influenced by the Lode angle. As the Lode angle increases, the shear strength and dilatancy decrease. The decreasing gradients of shear strength and dilatancy versus Lode angle are almost the same, indicating that the constitutive models for OC and NC clays can share the same rules for strength and dilatancy. The formation of shear bands in the specimens appears to have caused the abnormal test results in that case.
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Acknowledgments
The authors express their appreciation to Mr. Satoshi Sakagawa, who carried out the bulk of the tests. The financial support of National Nature Science Foundation of China (Grant No. 41002097) is gratefully acknowledged.
References
ASTM. (1999). “Standard test for one-dimensional consolidation properties of soil.” D2435-96, West Conshohocken, PA.
Callisto, L., and Calabresi, G. (1998). “Mechanical behaviour of a natural soft clay.” Geotechnique, 48(4), 495–513.
Kumruzzaman, M., and Yin, J.-H. (2012). “Influence of the intermediate principal stress on the stress–strain–strength behaviour of a completely decomposed granite soil.” Geotechnique, 62(3), 275–280.
Lade, P. V., and Musante, H. M. (1978). “Three dimensional behavior of remolded clay.” J. Geotech. Engrg. Div., 104(2), 193–209.
Matsuoka, H., and Nakai, T. (1974). “Stress-deformation and strength characteristics of soil under different principal stresses.” Proc., Japan Society of Civil Engineers (JSCE), Vol. 232, JSCE, Tokyo, 59–70.
Nakai, T., and Hinokio, M. (2004). “A simple elastoplastic model for normally and overconsolidated soils with unified material parameters.” Soils Found., 44(2), 53–70.
Nakai, T., Matsuoka, H., Okuno, N., and Tsuzuki, K. (1986). “True triaxial tests on normally consolidated clay and analysis of the observed shear behavior using elastoplastic constitutive models.” Soils Found., 26(4), 67–78.
Prashant, A., and Penumadu, D. (2004). “Effect of intermediate principal stress on overconsolidated kaolin clay.” J. Geotech. Geoenviron. Eng., 284–292.
Wood, D. M. (1975). “Explorations of principal stress space with kaolin in a true triaxial apparatus.” Geotechnique, 25(4), 783–797.
Ye, G. L., Sheng, J. R., Ye, B., and Wang, J. H. (2012). “Automated true triaxial apparatus and its application to overconsolidated clay.” Geotech. Test. J., 35(4), 1–12.
Ye, G. L., Zhang, F., Yashima, A., Sumi, T., and Ikemura, T. (2005). “Numerical analyses on progressive failure of slope due to heavy rain with 2D and 3D FEM.” Soils Found., 45(2), 1–17.
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© 2013 American Society of Civil Engineers.
History
Received: Jun 7, 2012
Accepted: Oct 21, 2013
Published online: Dec 4, 2013
Published in print: Apr 1, 2014
Discussion open until: May 4, 2014
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