Brief details are given of experiments held at the University of Manchester Institute of Science and Technology into the behaviour of large diameter thin walled buried pipes under rising ground water levels or heavy lorry load. In the experiments the self-weight of the uniform backfill around large diameter plastic pipes was simulated in a centrifuge. In the experiment simulating a rising water table, strain gauges on the pipe wall indicated that compressive stress levels immediately prior to failure were much lower than the yield stress. Failure was apparently due to the formation of an inward buckle at the invert. In the experiments simulating a heavy vehicle, failure was observed by two simultaneous events: plastic deformation or rupture occurred on sections of the pipe wall, and the lorry fell into the collapsed pipe. The critical vehicle load varied with cover depth, as did the form of failure, and the wall stresses were all within the elastic range of the material.

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 23
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00260761
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 20 1974 12:00AM