A MECHANISTIC DESIGN APPROACH FOR UNSEALED MINE HAUL ROADS

This paper presents an approach to proportioning the thickness of unsealed mine haul roads based upon mechanistic design principles. These principles involve: (i) the calculated response by elastic analysis of a layered pavement to wheel loads; (ii) the application of limiting criteria for specific response characteristics such as stress or strain in critical parts of the pavement and vertical deflection at the surface. A case study of mine haul roads at Tarong, south-east Queensland, describes how a falling weight deflectometer was used to assess variations to dynamic non-destructive loading along about 4 km of haul road. This testing provided guidance in the development of Young's modulus values for use in elastic analysis of the pavement using CIRCLY. Wheel loads ranging from 320 to 620 kN were applied to examine subgrade strain and stress and surface deflection for arange of pavement thicknesses. Implications of the magnitude of these parameters for haul road performance are then discussed. The results of thestudy have been used to recommend pavement thicknesses less than those obtained by empirical approaches. It is also possible to provide comment onthe impact of greater wheel loads than those currently in use on an existing haul road system. (a) For the covering abstract of this conference see IRRD abstract no. 861222.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 69-81

Subject/Index Terms

Filing Info

  • Accession Number: 00669737
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Dec 23 1994 12:00AM