Bounding Surface Model for Rockfill Materials Dependent on Density and Pressure under Triaxial Stress Conditions
This article has been corrected.
VIEW CORRECTIONPublication: Journal of Engineering Mechanics
Volume 140, Issue 4
Abstract
Density and pressure have great influences on the strength and stress-strain behaviors of rockfill material. A series of triaxial compression tests were conducted for Tacheng rockfill material with different initial consolidated void ratios and initial confining pressures. From the experimental results, Tacheng rockfill material presents behaviors of strain hardening, postpeak strain softening, volumetric contraction, and expansion with a range of densities and pressures. For the sake of simplicity, the critical state line (CSL) is linear in the plane of the mean effective stress versus the deviatoric stress. A simple expression related to the initial consolidated void ratio was proposed for the CSL of rockfill material in the plane of the void ratio versus the logarithm of mean effective stress. A comprehensive equation incorporating a state parameter is proposed to describe the complex dilatancy behaviors of Tacheng rockfill material with a range of densities and pressures. The stress ratios at the dilatancy and the peak stress ratio states are both formulated as exponential functions of the state parameter. A bounding surface model that incorporates the proposed CSL in both planes of the mean effective stress versus the deviatoric stress and the void ratio versus the logarithm of mean effective stress was established. The model, which has a set of the same model parameters, can well predict the behaviors of strain hardening and volumetric contraction for rockfill material with a loose state or in a high confining pressure and the behaviors of postpeak strain softening and volumetric expansion for rockfill material with a dense state or in a low confining pressure.
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Acknowledgments
The writer would like to acknowledge the financial support from the 111 Project (Grant No. B13024), the Program for Changjiang Scholars and Innovative Research Team in University (Grant No. IRT1125), and the Fundamental Research Funds for the Central Universities (Grant No. 2011B14514).
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© 2014 American Society of Civil Engineers.
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Received: Dec 23, 2012
Accepted: Aug 21, 2013
Published online: Aug 23, 2013
Published in print: Apr 1, 2014
Discussion open until: Jun 2, 2014
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