This report presents a detailed statistical analysis and graphical presentation of more than 120,000 subgrade
modulus values from Minnesota state roads and highways. These subgrade modulus values are based on Falling
Weight Deflectometer measurements collected by the Minnesota Department of Transportation between 1983 and
The report gives a one-page summary for each road in each district where measurements exist. This summary
page contains a plot of the modulus versus the reference post, modulus versus year when a measurement is
collected, modulus histogram, and a number of state-wide summaries. The one-page summaries are accompanied
by a number of district and state-wide summaries, and nomograms for the selection of sample spacing, to form the
state of Minnesota subgrade modulus Atlas.
In addition to this report, a Microsoft Windows-based computer program, the Minnesota Subgrade Modulus
Atlas--Online, allows for the detailed analysis of the subgrade modulus along state roads and highways. This
analysis can be carried out on a state-wide scale, on a small project scale of less than one mile, or any scale in
between. "This electronic form of the Atlas can be easily upgraded as additional measurements become available.
Barnes, Randal J.; Jankovic, Igor; Colom, David.
Statewide statistical subgrade characterization.
Minnesota Department of Transportation.
Retrieved from the University of Minnesota Digital Conservancy,
Content distributed via the University of Minnesota's Digital Conservancy may be subject to additional license and use restrictions applied by the depositor.