WHY A SUB-BALLAST?

PERCHE UN BALLAST

Results of the fatigue analysis of a series of traditional-type structures with different ballast thicknesses, whch reveal unsatisfactory fatigue behaviour of the ballast, leading to a rapid lowering of the track level. Its behaviour is quite different when there is a sub-ballast as the ballast works exclusively on the basis of compression without fatigue phenomena. The application of Miner's Law means that the theoretical use of the sub-ballast can be calculated at about a century. Another remarkable advantage of a sub-ballast lkayer is that it evens out the subgrade. The methodology adopted can easily be applied to different types of traffic and to different structure characteristics.

• Corporate Authors:

  Collegio Ingegneri Ferroviari Italiani

  Via Giolitti 34
  Rome,   Italy 
• Authors:
  • Orlandi, D
• Publication Date: 1985-8

Language

• Italian

Media Info

• Features: Photos; References; Tables;
• Pagination: p. 447-453
• Serial:
  • INGEGNERIA FERROVIARIA
  • Volume: 40
  • Issue Number: 8

Subject/Index Terms

• TRT Terms: Ballast (Railroads); Fatigue strength; Mechanical properties; Railroad tracks; Subballast; Subgrade (Pavements)
• Old TRIS Terms: Ballast mechanics; Track structures
• Subject Areas: Operations and Traffic Management; Public Transportation; Railroads;

Filing Info

• Accession Number: 00456217
• Record Type: Publication
• Source Agency: International Union of Railways
• Files: TRIS
• Created Date: Jul 31 1986 12:00AM