Reliable Prediction of Shear Strength of Swelling Clays

Accurate prediction of the shear strength of swelling clays is extremely important for the design of roads, railway infrastructure, foundations, embankments, slopes, canals, erosion control, retaining walls, etc. The damage caused by swelling clays to the U.S. infrastructure is estimated to be of the order of about $13 billion per year (2009). Swelling clays are found in various parts of the United States and the world. In the red and blue colored regions contain soils with high swelling potential and orange, and green colored regions contain soils with moderate to low swelling potential. Portions of North and South Dakota contain soils that have high swelling potential. Overestimation of strength parameters can lead to failures and underestimation can lead to significant increase in the cost of the project. Shear strength of soils with high swelling clay content, can vary from high values when swelling is restrained to significant degradation in strength or even complete loss of strength due to swelling. The change in shear strength can also be seasonal. Fundamental strength parameters that define strength properties of soils are related to a variety of factors that include soil type, microstructural characteristics, fluid properties, mineralogy, saturation, etc. Reliable predictive tools that can accurately predict the shear strength of swelling clays are lacking. Our prior work on clays demonstrates the key role of molecular interactions on the evolution of microstructure and the macroscopic properties such as permeability, consolidation, and swelling pressure.

Language

  • English

Project

  • Status: Active
  • Funding: $200000
  • Contract Numbers:

    DTRT13-G-UTC38

  • Sponsor Organizations:

    Research and Innovative Technology Administration

    University Transportation Centers Program
    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Kline, Robin

  • Performing Organizations:

    North Dakota State University, Fargo

    College of Engineering
    Department of Civil Engineering
    Fargo, ND  United States  58105
  • Principal Investigators:

    Katti, Dinesh

    Katti, Kalpana

  • Start Date: 20160219
  • Expected Completion Date: 20180731
  • Actual Completion Date: 0
  • Source Data: MPC-506

Subject/Index Terms

Filing Info

  • Accession Number: 01598863
  • Record Type: Research project
  • Source Agency: Mountain-Plains Consortium
  • Contract Numbers: DTRT13-G-UTC38
  • Files: UTC, RiP
  • Created Date: May 5 2016 12:41PM