Journal
ENGINEERING GEOLOGY
Volume 195, Issue -, Pages 104-110Publisher
ELSEVIER
DOI: 10.1016/j.enggeo.2015.05.029
Keywords
Dilatancy; Confining pressure; Peak state friction angle; Critical state friction angle; Excess friction angle; Maximum dilatancy angle
Funding
- 111 Project [B13024]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1125]
- Fundamental Research Funds for the Central Universities [106112015CDJXY200008]
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The influence of the intermediate principal stress ratio (i.e., the b-value) on the stress-dilatancy relation of coarse granular soils was investigated by a series of true triaxial compression tests conducted under the constant-p' and constant-b loading conditions. It was observed that the peak and critical state friction angles increased with decreasing confining pressure or increasing b-value. An increase in the confining pressure or b-value resulted in a decrease in the maximum dilatancy angle. In addition, the relationshiptetween the excess friction angle (i.e., the difference between the peak and critical state angles) and maximum dilatancy angle was greatly influenced by the b-value. A linear equation incorporating the effect of the b-value was proposed for this stress-dilatancy relationship. The perditions of the proposed equation could be in good agreement with the test data of coarse granular soils. The proposed b-dependent stress-dilatancy equation could be useful in the foundation of a constitutive model for granular soils. (C) 2015 Elsevier B.V. All rights reserved.
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