MODELLING THE RESPONSE OF PAVEMENTS TO SUBGRADE VOLUME CHANGE

This paper demonstrates how, by using a thermal analogy and a simplified and consistent theoretical description of swelling and swell pressure development in expansive clays, it is possible to carry out useful, relevant parametric studies of the interaction between a swelling clay subgrade and an overlying pavement. For the first time, typical ranges of values of swell and swell suppression indices are deduced from the literature for use in parametric studies for a wide range of expansive clays. The existing fast Lagrangian finite difference program FLAC is adapted, using its thermo-mechanical analysis option to simulate the wetting up and distortion of an unbound road base on an extremely expansive clay subgrade. The results show the critical effect of edge restraint of both pavement and subgrade and the relative effects of swell and swell suppression indices. (a) For the covering abstract of this conference see IRRD abstract no. 861222.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 199-210

Subject/Index Terms

Filing Info

  • Accession Number: 00669747
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Dec 23 1994 12:00AM