Numerical Simulation of Triaxial Stress Probes and Recent Stress-History Effects of Compressible Chicago Glacial Clays
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 7
Abstract
Numerical simulations and calibration of hypoplasticity constitutive parameters for Chicago clays are presented based on laboratory tests conducted on high-quality block samples and field tests from excavations located in the Chicago, Illinois area. The parameters for the hypoplasticity model enhanced with the intergranular strain concept are calibrated from the results of index tests, oedometer tests, and -consolidated undrained triaxial compression and extension tests. Drained stress probes conducted in a triaxial cell after three different preshearing stress paths were used to compare the numerical results with the triaxial test results. One path was applied to study the clay stress-strain behavior at in situ conditions and the remaining two to isolate the effects of recent stress history. The results are shown in terms of the secant shear and bulk stiffness, shear and volumetric stress-strain responses at small and large strains, and stress path reversals.
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Acknowledgments
Financial support for this work was provided by the National Science Foundation Grant No. CMMI-1538506. The support of Dr. Richard Fragaszy, program director at NSF, is greatly appreciated. The authors would like to acknowledge Mr. Andres F. Uribe-Henao for his help in checking the numerical models and calibration of the constitutive parameters. Financial support for Dr. Fuchen Teng was provided by the National Science Council (Grant No. 105-2218-E-011-016) in Taiwan. Financial support for Dr. Taesik Kim was provided by the Basic Research Laboratory Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (Project No. NRF 2015-041523).
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©2017 American Society of Civil Engineers.
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Received: Apr 26, 2015
Accepted: Dec 2, 2016
Published online: Mar 17, 2017
Published in print: Jul 1, 2017
Discussion open until: Aug 17, 2017
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