REPEATED LOADING OF REINFORCED FINITE DEPTH GRANULAR MATERIAL

Granular track supports built over compacted clay or silt subgrades are often susceptible to excessive settlement failure due to lateral spreading of the ballast, initiated by the seasonal softening of a thin upper layer of the subgrade. The inclusion of geosynthetic geogrid reinforcement within the granular support is investigated as a method of reducing the settlement of these structures. The investigation was conducted in the laboratory using a small-scale model of a track-ballast system overlying artificial subgrades of different compressibilities, including a rigid subgrade. The model was subjected to a program of repetitive loading, using a cyclic load that returned to zero at the end of each cycle. The performance of test configurations reinforced with a single layer of geosynthetic geogrid was compared with unreinforced configurations. When placed at the optimal depth, the geosynthetic geogrid reduced the rate at which accumulated plastic settlements were generated for all the subgrade conditions.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0935803084
• Corporate Authors:

  Industrial Fabrics Association International

  345 Cedar Building, Suite 450
  St Paul, MN  United States  55101-1088
• Authors:
  • Walters, D L
  • Raymond, G P
• Conference:
  • Geosynthetics '99: Specifying Geosynthetics and Developing Design Details
  • Location: Boston, Massachusetts, U.S.A.
  • Date: 1999-4-28 to 1999-4-30
• Publication Date: 1999

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 697-709

Subject/Index Terms

• TRT Terms: Ballast (Railroads); Compacted clays; Compressibility; Depth; Failure; Geogrids; Geosynthetics; Granular materials; Material reinforcement; Railroad tracks; Repeated loads; Settlement (Structures); Silts; Subgrade (Pavements); Supporting
• Uncontrolled Terms: Finite depth
• Subject Areas: Geotechnology; Highways; Materials; Railroads; I42: Soil Mechanics;

Filing Info

• Accession Number: 00795527
• Record Type: Publication
• ISBN: 0935803084
• Report/Paper Numbers: Volume 2
• Files: TRIS
• Created Date: Jul 21 2000 12:00AM