Alternatives to Heavy Test Rolling for Cohesive Subgrade Assessment

This paper describes comparison measurements to assess support conditions of compacted cohesive subgrade materials using heavy test rolling, roller-integrated compaction measurements, and light weight deflectometer (LWD) and dynamic cone penetrometer (DCP) point measurements. Results indicate that many of these measurements are empirically related. Further, roller measurement values and LWD/DCP point measurements can reliably indicate the rut depth under test rolling. Target values for QA are developed for these different measurements with respect to the Minnesota Department of Transportation (Mn/ DOT) heavy test rolling criteria for rut depth <50 mm. DCP profiles on compacted subgrade layers show vertical non-uniformity typically with a stiff layer underlain by a soft layer. Support capacities of the subgrade under the heavy test roller were analyzed using a layered bearing capacity solution and compared to measured rut depths at the surface. A simple chart solution is presented to determine target shear strength properties of compacted subgrades from DCP profiles to ensure heavy test rolling rut depths are less than the maximum allowable limit.


  • English

Media Info

  • Media Type: Web
  • Edition: e-book ISBN 9780203865286
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 45-55
  • Monograph Title: Bearing Capacity of Roads, Railways and Airfields. Proceedings of the 8th International BCR2A'09 Conference

Subject/Index Terms

Filing Info

  • Accession Number: 01342891
  • Record Type: Publication
  • ISBN: 9780415871990
  • Files: TRIS
  • Created Date: Jun 23 2011 9:07AM