Four lines of experimental pipes 300 mm in diameter were laid transversely across the roadway during construction of the Marlow-Bisham By-Pass (A404) in 1972. The pipes were made of upvc, clayware, asbestos-cement and steel, and were laid in trenches at a crown level of 0.70 M below subgrade before the pavement was constructed. The final depth was 1.2M below the road surface. Instrumentation was installed to measure strains in the pipe wall (clay and asbestos-cement and steel pipes) and horizontal and vertical deformation (upvc and steel pipes). Soil pressures were measured above all pipes and additionally at the sides of the upvc and steel pipes. Axle loads of traffic on the completed road were recorded by an electronic weighbridge installed adjacent to the experimental site. Measurement of strain, pipe deflection and soil pressures were made during installation of the pipes and during the subsequent passage of heavy construction traffic over the site. Controlled loading tests were carried out over the pipes after completion of the roadway, and the effect of road traffic was monitored after the road was opened. Results indicate that the loading effect of construction traffic traversing the site on the subgrade before construction of the pavement was very much more severe than that of road traffic on the finished pavement. /Author/TRRL/

  • Corporate Authors:

    Transport and Road Research Laboratory (TRRL)

    Wokingham, Berkshire  United Kingdom 
  • Authors:
    • TROTT, J J
    • Gaunt, J
  • Publication Date: 1976

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 38 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00137754
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Lab. Rpt. 692
  • Files: ITRD, TRIS, ATRI
  • Created Date: Apr 13 1977 12:00AM