Small Strain Path-Dependent Stiffness of Toyoura Sand: Laboratory Measurement and Numerical Implementation
Publication: International Journal of Geomechanics
Volume 17, Issue 1
Abstract
Although Toyoura sand has been widely used as a standard material for physical model tests (particularly centrifuge model tests), its path-dependent stiffness degradation curves are rarely reported in the literature. This leads to difficulties in back-analyzing and understanding the physical tests involving significant changes in the direction of stress paths (such as unloading problems). In this study, path-dependent stiffness degradation curves of medium-dense Toyoura sand were determined by carrying out a series of stress-path triaxial tests, with local strain measurements. In the triaxial tests, four typical recent stress histories (changes of path direction = 0, 90, –90, and 180°) were simulated. The measured small strain stiffnesses of Toyoura sand were then used to calibrate an advanced hypoplastic model that accounts for path-dependent soil stiffness at small strains. To justify the validity of the calibrated hypoplastic model and model parameters, a Type A numerical prediction and a centrifuge model test were carried out to simulate a typical unloading problem (i.e., excavation) in medium-dense Toyoura sand. Triaxial test results show that a 180° reversal in the direction of the stress path increased the initial secant modulus of Toyoura sand by eight times. The path dependency of soil stiffness, however, vanished when the deviatoric strain exceeded 0.3%. The ground deformations (resulting from excavation) predicted by the numerical analysis show reasonable agreement with the measured data from the centrifuge test. This suggests the potential applicability of the calibrated soil model and its model parameters in predicting or back-analyzing other physical model tests in Toyoura sand.
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Acknowledgments
The authors acknowledge the financial support provided by the Research Grants Council of the HKSAR (General Research Fund Projects 617511 and 617213) and EPFL04, National Natural Science Foundation of China (Projects 51408540 and 51509041), National Science Foundation for Distinguished Young Scholars of China (Grant 51325901), and State Key Program of National Natural Science of China (Grant 51338009).
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© 2016 American Society of Civil Engineers.
History
Received: Aug 13, 2014
Accepted: Jan 26, 2016
Published online: Apr 15, 2016
Discussion open until: Sep 15, 2016
Published in print: Jan 1, 2017
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