BASIS OF THE DIMENSIONS OF FROZEN STRIPS AT SMALL BRIDGES AND CULVERTS

OBOSNOVANIE RAZMEROV MERZLOTNYKH POIASOV U MALYKH MOSTOV I TRUB

To control soil ice layers on the Amur-Yakutsk main line, frost belts were applied. These were trenches located perpendicularly to the direction of the motion of the soil waters. The width was 5-10 m, depth 0.5-1.0 m, and the trench was located 50-100 m from the protected object. It is known that moss, peat, and sod possess great thermal resistance. During excavation of the canal they move away, provoking accelerated freezing of the soil in that location, and quicker (relative to natural conditions) confluence of the seasonal freezing with the water resistance. Beneath the canal there appears a frost dike, fencing off the track by soil waters which escape to the surface above the canal, where they freeze, forming an ice layer. Consequently, the frost belt provokes the formation of an ice layer in a spot safe for construction. The fundamental geometrical dimensions of the frost belts are depth and breadth. These are discussed in the report, and ways for determining them are revealed. The depth depends upon the power of the soil flow, the level of soil waters relative to the diurnal surface, and other factors. The breadth is determined independently of the power of the water bearing layer, soil type, and inundation, and regional climatic conditions. This is connected to the drop of the permafrost border below the trench, leading to the fact that in the winter the trench can not intercept all the soil waters and cause natural formation of ice layers. The author therefore proposes a frost-impermeable screen consisting of vertical and horizontal screens.

• Supplemental Notes:
  • Abstract only is available in English, original untranslated as of November 1976.
• Corporate Authors:

  Institute of Railway Transportation Engineers

  Novosibirsk,   USSR 
• Authors:
  • Merkulov, D M
• Publication Date: 0

Language

• Russian

Media Info

• Features: References; Tables;
• Pagination: p. 211-215
• Serial:
  • Publication of: Institute of Railway Transportation Engineers
  • Issue Number: 0
  • Publisher: Institute of Railway Transportation Engineers

Subject/Index Terms

• TRT Terms: Bridge design; Bridges; Culverts; Deicing; Drainage; Freezing; Frost protection; Ice; Insulation blankets; Railroad transportation; Runoff; Size; Soil water; Soils; Structural design; Watersheds
• Old TRIS Terms: Soil freezing
• Subject Areas: Bridges and other structures; Geotechnology; Highways; Hydraulics and Hydrology; Railroads;

Filing Info

• Accession Number: 00130264
• Record Type: Publication
• Source Agency: Federal Railroad Administration
• Report/Paper Numbers: No. 90 Proceeding
• Files: TRIS, USDOT
• Created Date: Nov 23 1976 12:00AM