MONOTONIC LOADING OF GEOGRID-REINFORCED FINITE DEPTH GRANULAR MATERIAL

When granular supports are built on firm clay or silt subgrades, seasonal softening of a thin upper layer may be sufficient to permit a bearing capacity failure within the granular material. A small-scale model of a track-ballast system overlying artificial subgrades of different compressibilities, including a rigid subgrade, was subjected to a program of monotonic loading. The performance of test configurations reinforced with a single layer of geogrid was compared with unreinforced configurations. Test results indicate that the optimum depth for placing the geogrid reinforcement, for all subgrades, is close to the base of the footing. The compressibility of the thin upper subgrade layer had the greatest influence on the load-settlement response of the system. The geosynthetic geogrid produced a bearing capacity ratio in the range 1.9 to 4.3 while increasing the modulus of subgrade reaction measured at the surface.

• 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. 265-278

Subject/Index Terms

• TRT Terms: Ballast (Railroads); Bearing capacity; Compressibility; Depth; Failure; Footings; Geogrids; Geosynthetics; Granular materials; Loads; Railroad tracks; Reinforcing materials; Settlement (Structures); Subgrade (Pavements)
• Uncontrolled Terms: Finite depth; Monotonic
• Subject Areas: Design; Geotechnology; Highways; Materials; Pavements; Railroads; I22: Design of Pavements, Railways and Guideways; I35: Miscellaneous Materials;

Filing Info

• Accession Number: 00795515
• Record Type: Publication
• ISBN: 0935803084
• Report/Paper Numbers: Volume 1
• Files: TRIS
• Created Date: Jul 20 2000 12:00AM