Documenting Best Management Practices for Cutslopes in Ice-rich Permafrost

In northern Alaska ice-rich permafrost is often encountered during the construction of roads and other projects. When ice-rich permafrost is exposed during late spring through early fall the potential for thawing is great. Ice-rich permafrost, typically silts with segregated ice or massive ground ice, experiences a substantial reduction in strength owing to the exceedingly high water content and lack of drainage and consolidation during thaw. The result can be a quagmire that “bogs down” equipment or, if the exposure is a cutslope, slope failure. In addition to trafficability and stability problems, environmental oversight increasingly focuses attention on particulate-rich effluent and poor aesthetics which are common by-products of the thaw process. This study presents several construction projects in northern Alaska where problems due to thawing permafrost were a significant environmental concern. The techniques employed or proposed to mitigate the problems are described and several best management practices are presented.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 66p

Subject/Index Terms

Filing Info

  • Accession Number: 01632262
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-AK-RD-09-01
  • Contract Numbers: DOT&PF AKSAS #76987; HPR-4000(60)/T2-07-04
  • Files: TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Feb 28 2017 2:10PM