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.

• Record URL:
  • http://www.maine.gov/mdot/tr/documents/pdf/report0401f.pdf
• 
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/2345-0987
• Corporate Authors:

  University of Maine, Orono

  Department of Civil and Environmental Engineering, Boardman Hall
  Orono, ME  United States  04469-5711

  Maine Department of Transportation

  Child House, 16 State House Station
  Augusta, ME  United States  04333-0016
• Authors:
  • St Pierre, Michael A
  • Humphrey, Dana N
• Publication Date: 2007-4

Language

• English

Media Info

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

Subject/Index Terms

• TRT Terms: Frost; Frost heaving; Insulating materials; Mathematical models; Pipe; Pipe laying; Polystyrene; Soil types; Subgrade (Pavements); Thaw
• Uncontrolled Terms: Differential heave; Frost penetration
• Geographic Terms: Maine
• Subject Areas: Construction; Geotechnology; Highways; I42: Soil Mechanics; I50: Construction and Supervision of Construction;

Filing Info

• Accession Number: 01053596
• Record Type: Publication
• Report/Paper Numbers: ME 04-1
• Files: TRIS, STATEDOT
• Created Date: Jul 18 2007 3:36PM