Influence of Intermediate Principal Stress and Principal Stress Direction on Drained Behavior of Natural Soft Clay
Publication: International Journal of Geomechanics
Volume 18, Issue 1
Abstract
Drained torsional shear tests were performed on hollow cylindrical intact soft clay specimens to investigate the anisotropic deformation, strength, and noncoaxial behavior in general stress states involving variations in both the magnitude and direction of the principal stresses. Tests were conducted by maintaining a fixed principal stress direction α relative to the vertical direction while keeping the intermediate principal stress coefficient b constant. It was found that the magnitudes of the radial strain εr were dependent on the b value, and the magnitudes of circumferential strain εθ were dependent on the α angle. The influence of b and α on the relationship between volumetric strain and shear stress was less significant. The stress paths for all α angles at b = 0.5 were determined under various stress levels. Furthermore, the experimental results showed that the noncoincidence between the directions of strain increment and stress existed in clay, and the noncoaxiality was influenced by both intermediate principal stress and principal stress direction.
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Acknowledgments
The work presented in this article was supported by China Postdoctoral Science Foundation (No. 2017M610461), the National Natural Science Foundation of China under Grants 51639002 and 50909020, the National Key Research and Development Program of China under Grant 2016YFC0800205, the 111 Project under Grant B13024, and the Natural Science Foundation of Zhejiang Province under Grant LQ14E080011. These financial supports are gratefully acknowledged.
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Published In
International Journal of Geomechanics
Volume 18 • Issue 1 • January 2018
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Jun 14, 2016
Accepted: Jul 31, 2017
Published online: Oct 31, 2017
Published in print: Jan 1, 2018
Discussion open until: Mar 31, 2018
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