GEOGRID REINFORCED CAPPING LAYER FOR MAJOR HIGHWAY, A51 TARVIN BYPASS, UNITED KINGDOM

This case history describes the use of a Tensar geogrid to reinforce the capping layer during the construction of the A51 bypass to the south west of Tarvin, Cheshire, England. For areas where the subgrade was expected to be weak, the design required 600mm of capping layer material and 1500mm of high quality well graded cellular aggregates for the sub-base. To evaluate the reinforcing effect of a light geogrid reinforcement, two layers of Tensar SS1 were specified within the capping layer of 75mm down crusher run limestone. Such an aggregate grading ensured optimal mechanical interlock of the aggregate into the geogrid's aperture, thus reinforcing by imparting horizontal strains from the aggregate to the geogrid. The equivalent CBR (California Bearing Ratio) values, resulting from plate bearing tests of the capping layer and sub-base, are tabulated. The geogrid reinforcement can lead to reduced aggregate thicknesses in road construction. For the covering abstract see IRRD 865821.

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  • Corporate Authors:

    BiTech Publishers, Limited

    173-11860 Hammersmith Way
    Richmond, British Columbia V7A 5G1,   Canada 
  • Authors:
    • Hall, C D
  • Publication Date: 1993

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00668207
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-9696924-0-4
  • Files: ITRD
  • Created Date: Nov 2 1994 12:00AM