Elastic-Viscoplastic Modeling for Natural Soft Clays Considering Nonlinear Creep
Publication: International Journal of Geomechanics
Volume 15, Issue 5
Abstract
This paper focuses on nonlinear creep behavior with a consecutively decreasing creep coefficient fully related to the soil density. Conventional oedometer tests on reconstituted samples of several natural soft clays are selected to clarify the evolution of creep coefficient throughout testing. On this basis, a simple nonlinear creep formulation is proposed accounting for the effect of volumetric packing of soil assemblies. The formulation is then incorporated into a newly developed elastic-viscoplastic model to take into account the nonlinear creep of natural soft clays. One additional parameter is added that can be determined in a straightforward way from an oedometer test without additional experimental cost. The enhanced nonlinear creep model is examined by simulating a conventional oedometer test on reconstituted Haarajoki clay. The improvement of predictions by the nonlinear creep formulation is highlighted by comparing predictions with constant . The enhanced model is further applied to Murro test embankment. The influence of consideration of nonlinear creep on the embankment behavior is discussed.
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Acknowledgments
This research was financially supported by the National Natural Science Foundation of China (Grant No. 41240024, 41372285), the opening project of the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Grant No. SKLGP2011K013), Shanghai Pujiang Talent Plan (Grant No. 11PJ1405700), Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20110073120012), and the European project CREEP (PIAPP-GA-2011-286397). This support is greatly appreciated. In addition, the authors thank Professor Minna Karstunen at University of Straithclyde, and Mr. Timo Stapelfeldt and Mr. Matti Lojander at Helsinki University of Technology, for their support.
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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: Jun 7, 2012
Accepted: Dec 27, 2012
Published online: Dec 29, 2012
Published in print: Oct 1, 2015
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