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Title: RESILIENT MODULUS OF SUBGRADE SOILS: COMPARISON OF TWO CONSTITUTIVE EQUATIONS
Accession Number: 00677582
Record Type: Component
Availability: Find a library where document is available Abstract: The concept of resilient modulus has been used to explain the nonlinear stress-strain characteristics of subgrade soils. During the past few decades, several constitutive models have been developed for the resilient modulus of subgrade soil. No stress or deformation analysis can be useful unless a correct constitutive equation that describes the actual behavior of material has been used in the analysis. When the correct form of constitutive equation is selected, there is a need for the accurate k parameters, which vary from soil to soil. Under a Georgia Department of Transportation research project, subgrade soil samples were tested in the laboratory using AASHTO T274-82 to determine their resilient moduli. Results were used to compare two widely used constitutive equations and to study the effect of material and physical properties of subgrade soils on the k values of these equations. Two well-known constitutive equations (bulk stress and universal model) are compared for their capability of modeling granular subgrade soils. This comparison shows that the resilient moduli of granular subgrade soils are better described by the universal model, where resilient modulus is a function of bulk stress and deviator stress. The universal model and the semi-log model, where the resilient modulus is a function of deviator stress, were selected to model granular and cohesive soils, respectively, to study the effect of material and physical properties of subgrade soils on their resilient moduli. Results show that the k parameters in the constitutive equations can be calculated using material and physical properties of the soil, and the values of k parameters vary within wide ranges for cohesive and granular subgrade soils.
Supplemental Notes: This paper appears in Transportation Research Record No. 1462, Compaction of Difficult Soils and Resilient Modulus Testing. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
Monograph Title: Monograph Accession #: 01495760
Language: English
Authors: Santha, B LankaPagination: p. 79-90
Publication Date: 1994
Serial: ISBN: 0309060680
Features: Figures
(10)
; References
(19)
; Tables
(7)
TRT Terms: Old TRIS Terms: Subject Areas: Geotechnology; Highways; Materials; I42: Soil Mechanics
Files: TRIS, TRB
Created Date: May 3 1995 12:00AM
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