Correlation of Resilient Modulus of Fine-Grained Soils with Common Soil Parameters for Use in Design of Flexible Pavements

Three-parameter models have been used in the past to represent the effects of confining and shear stresses on the value of resilient modulus. A new generation of such models allows better characterization of the variation of resilient modulus at low deviator stress. These models can be extended to incorporate the effects of soil type, soil structure and the soil physical state (combination of molding water content and dry unit weight) by relating the three parameters to explanatory variables consisting of common soil parameters. These three-parameters models were examined for compacted cohesive soils based on the results of 78 resilient modulus tests on low and high plasticity silts from the island of Oahu, Hawaii. Non-linear ordinary least squares method was used to estimate the model parameters. The results indicate that the new generation models not only provide a better fit than the older models, but they also provide a reasonable fit to the data that can capture the effects of stress state, soil type, soil structure and the soil physical state quite effectively. Based on this study, the Ni et al. (2002) model is recommended for use in design of flexible pavements on compacted cohesive subgrades on Oahu. Some tropical residual soils can undergo irreversible changes upon drying. One of the soils sampled had a relatively high natural water content. As a secondary objective, this soil was tested at three different stages of drying: first at its natural or "in situ" state, second after ovendrying the soil; and third after drying the soil to approximately half its natural water content. This material can be regarded as three different soils corresponding to the various stages of drying. One surprising observation is that the resilient modulus decreased with increasing degree of drying. However, drying the soil appears to increase the influence of confining stress suggesting that the soil behaves more granular. Also, the greater the degree of drying, the more sensitive is the resilient modulus to changes in deviatoric stresses.

  • Corporate Authors:

    University of Hawaii, Manoa

    Department of Civil and Environmental Engineering, 2540 Dole Street
    Honolulu, HI  United States  96822

    Hawaii Department of Transportation

    Highways Division, 869 Punchbowl Street
    Honolulu, HI  United States  96813

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Ooi, Phillip S K
    • Sandefur, K G
    • Archilla, A R
  • Publication Date: 2006-8-31

Language

  • English

Media Info

  • Media Type: Print
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 125p

Subject/Index Terms

Filing Info

  • Accession Number: 01044279
  • Record Type: Publication
  • Report/Paper Numbers: HWY-L-2000-06
  • Contract Numbers: 46510
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Mar 4 2007 11:38AM