THREE-DIMENSIONAL RESPONSE OF DEEPLY BURIED PROFILED POLYETHYLENE PIPE

Three-dimensional finite element stress analysis is used to examine the response of profiled polyethylene (PE) pipe under various burial conditions. Radial, circumferential, and axial normal stresses are examined for three pipes of different diameter buried at various depths in different soil materials. The implications for PE pipe design are examined in relation to arching, time-dependent pipe response, and tensile rupture. The study found that circumferential stresses are predominantly compressive and can be predicted reasonably well using conventional two-dimensional analysis. Tensile axial stresses, which develop in the inner liner of the pipe, cannot be evaluated using three-dimensional analysis. These tensions are greatest at the spring line and may be an important performance limit for lined corrugated PE pipe under deep burial. The pipes considered have a peak tension of not more than half the AASHTO allowable value at 22-m burial in very good quality (SW95) backfill material or 11 m in the same soil at lower density (SW85).

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 49-58
  • Monograph Title: Design and performance of underground pipe
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00715653
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jan 25 1996 12:00AM