Among the methods of prevention of frost heaving reviewed here, is the use of ballast to raise the whole length of a damaged railway section. A heave-protection pad capable of preventing the formation of humps or depressions should be placed within a hump in the case of irregular heaving. It is possible to use pads with higher thermal conductivity rather than thermal insulation pads for depressions. The use of the pad to displace the frost penetration levels beyond the frost heaving zone and the conjugation of these locations with adjacent ones is described. Among thermal insulation materials, the best properties are possessed by close cell foamed plastics. These plastic pads should possess a bearing capacity sufficient to withstand the live loads as well as being weather-proff and particularly, frost-proof and particularly, frost-proof. Characteristics of some types of plastic are tabulated. IIC-I and IIXB-I foam plastics with compressive strength of 8 kg/cm2 and 7 kg/cm2, respectively, have been subject to special laboratory investigation. Test results indicate that both types of plastic with a specific weight of 100 kg/m to the power 3, are a reliable material for road bed insulation. The service life of these plastics is expected to be 20-25 years. Such insulation has been placed under ballast (since 1969) with a sand layer 10 to 15 cm thick placed under the plastic insulation and a sand layer 10 cm thick, placed over the plastic to protect it against damage from stone ballast. A method is described for the precise calculation of thickness for a thermal insulation made of foam plastic, which takes into account the variety of climatic and geological engineering conditions. The development is reported of an apparatus called the hydrointegrator for studying and predicting various thermal processes.

  • Corporate Authors:

    Royal Norwegian Council for Scien & Indust Res

    Gaustadallen 25
    Oslo 3,   Norway 

    Royal Norwegian Council for Scientific & Ind Res

    Gaustadallen 25
    Oslo 3,   Norway 

    Royal Norwegian Council for Scien & Indus. Res.

    Gaustadalleen 25
    Oslo 3,   Norway 
  • Authors:
    • Shakhunjants
  • Publication Date: 1973-9

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 5-9
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00262977
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 12 1974 12:00AM