Alternative Shallow Cross Pipe Installation Method

The objective of this study was to evaluate the performance of shallow cross pipes insulated with extruded polystyrene insulation as a method to distribute differential heave over larger distances. Research consisted of field testing, instrumentation, and numerical modeling of insulated and uninsulated cross pipes at five selected sites across Maine. The effectiveness of the installation methods with extruded polystyrene insulation placed above and below the cross pipe were evaluated. Cross pipe installations were evaluated based on: influence of insulation, effect on pattern of frost penetration, surface frost heave, influence of soil type, and severity of the freezing season. Heave surveys indicated that pipes that develop heave have greater total heave away from the cross pipe than over the pipe resulting in differential heave. Results showed for sites that experienced significant total heave, the placement of insulation over the cross pipe increased both the magnitude and abruptness of the differential heave. This showed that the length of the transition insulation on each side of the cross pipe was inadequate. The maximum differential heave was observed to occur at the end of the freezing season and start of the spring thaw.


  • English

Media Info

  • Media Type: Print
  • Edition: Technical Report
  • Features: Appendices; Bibliography; Figures; Photos; References; Tables;
  • Pagination: 283p

Subject/Index Terms

Filing Info

  • Accession Number: 01053596
  • Record Type: Publication
  • Report/Paper Numbers: ME 04-1
  • Created Date: Jun 29 2007 7:49PM