DYKES ON PERMAFROST, KELSEY GENERATING STATION MANITOBA

PERFORMANCE STUDIES ON TWO SAND DYKES CONSTRUCTED ON PERENNIALLY FROZEN GROUND WERE INITIATED IN 1958 AT KELSEY GENERATING STATION ON THE NELSON RIVER. PERMAFROST OCCURRED UNDER THESE DYKES IN SCATTERED PATCHES OF VARIOUS THICKNESS AND SIZE. PRELIMINARY ANALYSIS INDICATED THAT WITHIN A 50-YEAR PERIOD SIGNIFICANT THAWING WOULD OCCUR BENEATH THE DYKE-WATER INTERFACE AND THAT THE PERMAFROST UNDER THE RESERVOIR WOULD THAW COMPLETELY. GROUND SETTLEMENTS OF UP TO 6 FT. WERE EXPECTED AS THAWING OCCURRED. TO CHECK THIS ESTIMATE FIELD INSTRUMENTATION WAS INSTALLED AND AN OBSERVATIONAL PROGRAM WAS BEGUN IN 1959. A DISTINCT PATTERN OF THAWING AND SETTLEMENT EACH YEAR HAS BEEN OBSERVED. MAJOR THAWING AND SETTLEMENT OCCUR DURING THE SUMMER MONTHS AT GREATER RATES THAN THOSE EXPERIENCED DURING THE WINTER. THE CHANGE IN RATE OF THAW AND SETTLEMENT IS DIRECTLY CONNECTED WITH THE CHANGE IN WATER TEMPERATURE OR RATE OF HEAT FLOW INTO THE GROUND. /CGRA/

• Supplemental Notes:
  • Vol 6, No 2, PP 139-157, 10 FIG, 1 TAB, 1 PHOT, 5 REF
• Authors:
  • Johnston, G H
• Publication Date: 0

Media Info

• Serial:
  • CANADIAN GEOTECHNICAL JOURNAL
  • Issue Number: 0
  • Publisher: National Research Council of Canada

Subject/Index Terms

• TRT Terms: Dikes; Field tests; Heat flow; Performance; Permafrost; Sand; Temperature; Thaw; Water
• Uncontrolled Terms: Field measurements
• Old TRIS Terms: Settlement forecast reliability; Settlement rate
• Subject Areas: Geotechnology; Highways; Marine Transportation;

Filing Info

• Accession Number: 00230960
• Record Type: Publication
• Source Agency: CANADIAN GOOD ROADS ASSOCIATION
• Files: TRIS
• Created Date: Apr 7 1970 12:00AM