Theoretical Analysis of Pressure-Dependent K0 for Normally Consolidated Clays Using Critical State Soil Models
Publication: International Journal of Geomechanics
Volume 18, Issue 3
Abstract
The coefficient of earth pressure at rest (K0) for normally consolidated clays increases nonlinearly with increasing consolidation pressure toward a steady value under high pressure rather than remaining constant. Analytical expressions for evaluating pressure-dependent K0 were derived from three representative critical state soil models: modified Cam-clay model (MCC), original Cam-clay model (OCC), and clay and sand model (CASM). In formulations, the authors relaxed a well-adopted assumption that stress ratio is kept constant during one-dimensional (1D) compression. It is found that the constant stress ratio, corresponding to the well-adopted assumption, is essentially a limit value of the stress ratio as predicted by MCC and CASM under high pressure during 1D compression. The predicted relationship between K0 and consolidation pressure is significantly affected by the critical state stress ratio. Without considering the effect of high pressure, the value of K0 may be considerably underestimated. The results predicted by the proposed formula based on CASM agree well with experimental data, showing the capability of this formula for predicting pressure-dependent K0.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the Fundamental Research Funds for the Central Universities (2017XKQY052). The authors would also like to thank the anonymous reviewers for their valuable suggestions.
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Published In
International Journal of Geomechanics
Volume 18 • Issue 3 • March 2018
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© 2017 American Society of Civil Engineers.
History
Received: May 20, 2016
Accepted: Sep 8, 2017
Published online: Dec 19, 2017
Published in print: Mar 1, 2018
Discussion open until: May 19, 2018
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