Resilient modulus modeling of unsaturated subgrade soils with matric suction control

Farhad Salour, Sigurdur Erlingsson, Claudia Zapata

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Stiffness of pavement subgrade materials that is commonly determined by the resilient modulus parameter is an important component in the mechanistic design of flexible pavement structures. Environmental effects such as seasonal variations in pavement moisture content can considerably influence this material property which should be properly considered in any realistic pavement design. The seasonal changes in moisture condition affects the stress state in the subgrade due to changes in the matric suction which is an important stress state variable in unsaturated soil mechanics. In this study, a modified test procedure and a predictive resilient modulus model that takes into account the subgrade soil matric suction as a stress state variable is presented. Two different silty sand subgrade materials were tested in unsaturated conditions using a series of Repeated Load Triaxial (RLT) tests. The tests were performed under various matric suctions (moisture contents) to enhance the understanding of its effect on the resilient modulus. The results showed a considerable influence of the moisture content (matric suction) on the subgrade resilient modulus. The resilient modulus data together with the suction measurements were used and a set of parameters for the enhanced predictive model were developed. This model accounts for seasonal variation of subgrade material stiffness by incorporating suction as a stress state variable.

Original languageEnglish (US)
Title of host publicationAsphalt Pavements - Proceedings of the International Conference on Asphalt Pavements, ISAP 2014
PublisherTaylor and Francis - Balkema
Pages1145-1154
Number of pages10
ISBN (Print)9781138027138
DOIs
StatePublished - Jan 1 2014
Event12th International Conference on Asphalt Pavements, ISAP 2014 - Raleigh, NC, United States
Duration: Jun 1 2014Jun 5 2014

Publication series

NameAsphalt Pavements - Proceedings of the International Conference on Asphalt Pavements, ISAP 2014
Volume2

Other

Other12th International Conference on Asphalt Pavements, ISAP 2014
CountryUnited States
CityRaleigh, NC
Period6/1/146/5/14

Keywords

  • Environmental effects
  • Matric suction
  • Moisture content
  • Resilient modulus
  • Subgrade
  • Unsaturated soil

ASJC Scopus subject areas

  • Building and Construction
  • Architecture

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