Strength and Deformation of Rockfill Material Based on Large-Scale Triaxial Compression Tests. I: Influences of Density and Pressure
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 140, Issue 12
Abstract
A series of large-scale triaxial compression tests were conducted to investigate the strength and deformation behaviors of Tacheng rockfill material (TRM) in relation to the initial void ratio and initial confining pressure. The critical state friction angle of TRM was expressed as a linear function of the logarithm of the initial confining pressure. The excess peak state friction angle and excess characteristic state friction angle of TRM were formulated as linear equations of a revised relative dilatancy index to capture the influences of density and pressure on the peak state and characteristic state friction angles. The initial elastic modulus, tangent modulus, and secant modulus of TRM were dependent on the initial void ratio and initial confining pressure. In addition, a formulation incorporating density and pressure was proposed to simulate the initial elastic modulus of TRM. The volumetric and deviatoric strains of TRM at the critical state were also dependent on density and pressure. The critical state line of TRM in the space descended with a decrease in the initial void ratio.
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Acknowledgments
The authors thank the 111 Project (Grant No. B13024), the Program for Changjiang Scholars and Innovative Research Team in University (Grant No. IRT1125), the National Natural Science Foundation of China (Grant No. 51379067), and Fundamental Research Funds for the Central Universities (Grant No. 2011B14514) for their financial support. The authors also thank Dr. W. G. Zhang and Dr. J. He, School of Civil and Environmental Engineering, Nanyang Technological University, for improving the language used in this paper.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 140 • Issue 12 • December 2014
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© 2014 American Society of Civil Engineers.
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Received: Jun 19, 2013
Accepted: Jul 15, 2014
Published online: Aug 21, 2014
Published in print: Dec 1, 2014
Discussion open until: Jan 21, 2015
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