Geo-Congress 2020
Stress-Dilatancy of Unsaturated Soil
Publication: Geo-Congress 2020: Geo-Systems, Sustainability, Geoenvironmental Engineering, and Unsaturated Soil Mechanics (GSP 319)
ABSTRACT
Dilatancy significantly influences the shear strength of soils, which is of paramount importance for geotechnical engineers, which is commonly measured in the form of dilatancy angle. Only a very limited number of studies have examined the factors influencing dilatancy of unsaturated soils. In this research, the results from a series of suction-controlled triaxial tests following conventional triaxial compression (CTC) stress paths at different suction levels and net confining pressures were utilized to study the variation of dilation angle of compacted silty soil specimens with matric suction and net confining pressure. It was also observed that for all selected approaches, an increase in matric suction resulted in an increase in peak dilation angle. An increase in net confining pressure resulted in a decrease in dilation angle. These experimental findings would aid in calibrating advanced constitutive models capable of accurately incorporating the effect of various stress states on the dilatancy angle.
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ACKNOWLEDGEMENTS
The experimental work described in this paper was part of a research project funded by the National Science Foundation (NSF) Major Research Instrumentation Program (NSF Program Manager: Dr. Joanne D. Culbertson; Award # 1039956) and NSF Industry-University Cooperative Research Center (I/UCRC) program funded “Center for the Integration of Composites into Infrastructure (CICI)” site at University of Texas at Arlington (NSF Program Director: Andre Marshall; Award # 1464489) and their support is gratefully acknowledged. Any findings, conclusions, or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.
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Information
Published In
Geo-Congress 2020: Geo-Systems, Sustainability, Geoenvironmental Engineering, and Unsaturated Soil Mechanics (GSP 319)
Pages: 420 - 429
Editors: James P. Hambleton, Ph.D., Northwestern University, Roman Makhnenko, Ph.D., University of Illinois at Urbana-Champaign, and Aaron S. Budge, Ph.D., Minnesota State University, Mankato
ISBN (Online): 978-0-7844-8282-7
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© 2020 American Society of Civil Engineers.
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Published online: Feb 21, 2020
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