Stress Dilatancy of Natural Soft Clay under an Undrained Creep Condition
Publication: International Journal of Geomechanics
Volume 15, Issue 5
Abstract
The stress–dilatancy relationship is a key point to capture the evolution of both strains and excess pore pressure during an undrained creep of natural soft clay. This paper focuses on investigating the stress dilatancy of natural soft clay during an undrained creep. Undrained triaxial creep tests are performed on -consolidated and isotropically consolidated samples of a typical Chinese soft marine clay with different stress levels. A unique stress–dilatancy curve is obtained from all test results. Several typical stress–dilatancy relations for soils are discussed, comparing them with experimental results. A common modification method for the stress dilatancy of sand is adopted and discussed for clay. All comparisons demonstrate that modified dilatancy equations can describe the stress–dilatancy relationship during an undrained creep. The modified dilatancy equation with the inclination of a potential surface seems to better describe the whole trend, and is suitable for natural soft clay.
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Acknowledgments
This research was financially supported by the National Natural Science Foundation of China (grant Nos. 41240024 and 41372285), the Research on Key Technology of Large-Span Municipal Tunnel Construction and Operation under Complicated Environment Project by the Research Fund for the Doctoral Program of Higher Education of China (grant No. 20110073120012), the Shanghai Pujiang Talent plan (grant No. 11PJ1405700), and the European project CREEP (grant No. PIAPP-GA-2011-286397). This support is greatly appreciated. In addition, the authors thank the first author’s former Ph.D. student, Mr. Hanbo Dan, for carrying out laboratory tests.
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Published In
International Journal of Geomechanics
Volume 15 • Issue 5 • October 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 22, 2012
Accepted: Nov 6, 2012
Published online: Nov 8, 2012
Published in print: Oct 1, 2015
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