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Video Conference

Geosynthetic Stabilized Subgrades and Bases

  • Dec 17, 2019 (2:30 - 4:30 pm CT; 1:30 - 3:30 pm MT)
    Video Conference (designated rooms at DOT sites)


DEADLINE: Thursday, December 12, 2019

A copy of the general sign in sheet can be downloaded by clicking here.

The above resource and more can be accessed by visiting the TLN Learning Management System (LMS).


Geogrids are geosynthetic materials used to stabilize and reinforce soils. Geogrids are most widely used in roadways for bridging soft subgrades and stabilizing aggregate materials. Other common applications include railbeds, foundations, and walls/slopes. Proposed course discussion topics:

  • Geosynthetic and geogrid overview
  • Geogrid function and mechanisms
  • Suitable fill materials
  • Nationally-recognized design guidelines (FHWA, AASHTO, etc)
  • Performance testing and evaluation
  • Unpaved roadway design with geogrid and the Giroud-Han design method
  • Subgrade stabilization with geogrid
  • Pavement structural design with geogrid and the AASHTO design method
  • Foundation improvement with geogrid for increased bearing capacity and reduced settlement
  • Project examples with geogrid installation and construction photos


Scott Whaley has been involved in design and construction of Tensar geogrid applications throughout North Dakota, including paved roads; unpaved roads and laydown areas; mainline and spur rail; general subgrade stabilization; and airport pavement overlays. Whaley earned a bachelors in civil engineering from the University of Florida and is a registered civil engineer in Georgia. He joined Tensar in 2008 as a staff engineer and has served in design, project management and sales roles for the roadway and grade separation applications. Whaley currently manages sales and marketing efforts of Tensar’s North Dakota roadway applications business. He is past president for the central Dacotah Section of the American Society of Highway Engineers and is a member of the Associated General Contractors of North Dakota, and the North Dakota Society of Professional Engineers.

Target Audience

Contractors, engineers, inspectors and maintenance personnel involved in roadway construction or maintenance will benefit from this technology transfer presentation.

NDSU Dept 2880P.O. Box 6050Fargo, ND 58108-6050