MECHANISTIC EVALUATION OF THE DEPTH TO BEDROCK AND ITS EFFECT ON THE RESPONSE OF 3D FINITE ELEMENT PAVEMENT MODELS

The results from static load based backcalculation programs indicate sensitivity to the assumed depth to bedrock. In this study, a mechanistic method has been developed for estimating the apparent depth to the stiff layer using the falling weight deflectometer (FWD) data. This predicted depth can be used in theoretical pavement models to assure that the fixed model boundary has an insignificant effect on the estimated surface deflection. The approach is based on utilizing three dimensional finite element (3D FE) to simulate pavement response to the FWD impact load. This approach accounts for the dynamic nature of the FWD load, friction at the layers' interfaces, and the 3D geometrical characteristics of pavement structures. After adjusting the model parameters so that the 3D FE generated deflection basin matches the experimentally measured one, the decay of displacement and stresses in the subgrade layer thickness is investigated along the axis of the FDW load application.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 73-86
  • Monograph Title: PAVEMENT SUBGRADE, UNBOUND MATERIALS, AND NONDESTRUCTIVE TESTING

Subject/Index Terms

Filing Info

  • Accession Number: 00799103
  • Record Type: Publication
  • ISBN: 9780784405093
  • Report/Paper Numbers: GSP No. 98
  • Files: TRIS
  • Created Date: Sep 3 2000 12:00AM