THE EFFECT OF LONGITUDINAL GRADE ON THE BEHAVIOUR OF A GRAVEL RUNNING SURFACE

THE INCIDENCE OF POTHOLING AND RUNNELLING IS RELATED TO LONGITUDINAL GRADE IN A ROAD HAVING A RUNNING SURFACE OF FINE LATERITE GRAVEL. IT IS SHOWN THAT A SURFACE REQUIRING LITTLE MAINTENANCE CAN BE OBTAINED PROVIDED THE GRADE IS KEPT WITHIN CERTAIN LIMITS. MINIMUM GRADES REQUIRED TO AVOID SERIOUS POTHOLING ARE INDICATED, AND IT IS SHOWN THAT THE SUSCEPTIBILITY TO POTHOLING AT THE SUMMIT OF CRESTS AND AT THE BOTTOM OF SAGS IS NOT SIGNIFICANTLY DIFFERENT. A GRAPH IS GIVEN RELATING LONGITUDINAL GRADE TO THE RELATIVE PROBABILITY OF THE OCCURENCE OF FIVE SURFACE CONDITIONS RANGING FROM SEVERELY POTHOLED TO SEVERELY RUNNELLED. ARGUMENTS ARE DEVELOPED WHICH LEAD TO THE CONCLUSION THAT THE GRAPH MAY BE GENERALLY APPLICABLE TO CONDITIONS OF DIFFERENT SURFACE MATERIAL, TRAFFIC INTENSITY, RAINFALL AND CAMBER. AN APPARENT RELATION BETWEEN THE FORMATION OF POTHOLES DURING WET WEATHER AND OF CORRUGATIONS DURING DRY WEATHER IS NOTED. COMMENTS ARE MADE ON THE INCIDENCE OF CROSS-RUNNELLING ON SUPERELEVATED CURVES AND GRAVEL SHOULDERS. /AUTHOR/

  • Supplemental Notes:
    • Vol 5, No 4, PP 572-577
  • Authors:
    • Wall, G D
  • Publication Date: 0

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00231169
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 2004 2:41AM