CONSTRUCTION AND PERFORMANCE OF PAVEMENT OVER MUSKEGS

The long-term performance of embankment and pavement over muskegs along the James Bay access road is described. The road was built in 1973 in a discontinuous permafrost region. The embankments were designed by a preloading method based on the Von Post classification. Twenty-four embankment sections over deep muskegs were selected from a total of 54 for detailed performance studies. They have been characterized by their distribution along the road; their geometry; the type and quality of their underlying soil; the Von Post classification; the shear strength and depth of their peat materials; and the height, type, and typical cross section of their embankment. The performance of pavement built over deep muskegs has been defined in terms of long-term settlement, change in pavement roughness, structural behavior, and deterioration of the surface. On the whole, 8 years after construction, the performance of pavement built over deep muskeg is satisfactory: Long-term settlement generally varies between 25 and 50 percent of the thickness of the peat deposit except where ice is present under the peat; the riding quality, which still has a good rating, is 50 percent rougher over peat deposits than elsewhere; there is a loose relationship between the height of embankment and the maximum deflection; the dynamic modulus of peat under the embankment is on the order of 50 mPa under Dynaflect loading conditions; and longitudinal cracking is two to four times greater over peat deposits than in other areas.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 68-80
  • Monograph Title: Construction and difficult geology: karstic limestone, permafrost, wetlands, and peat deposits
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00396858
  • Record Type: Publication
  • ISBN: 0309037603
  • Files: TRIS, TRB
  • Created Date: Jan 31 1986 12:00AM