CALCULATION METHODS FOR DETERMINATION OF DEPTHS OF FREEZE & THAW IN SOILS

THIS MANUAL CONTAINS CRITERIA AND METHODS FOR CALCULATING THE DEPTH OF FREEZE AND THAW IN SOILS, WITH CONSIDERATION OF THE EFFECTS OF OTHER ADJACENT MATERIALS, FOR THE DESIGN OF MILITARY FACILITIES IN ARCTIC AND SUBARCTIC REGIONS. THE DEPTHS TO WHICH FREEZING AND THAWING MAY OCCUR IN SOILS IS VERY IMPORTANT IN THE DESIGN OF PAVEMENTS, STRUCTURES, AND UTILITIES IN AREAS OF SEASONAL FROST AND PERMAFROST. METHODS OF CALCULATING SUCH DEPTHS, BASED ON HEAT-TRANSFER PRINCIPLES, ARE PRESENTED HEREIN. FOR DERIVATION OF BASIC EQUATIONS AND THE UNDERLYING THEORY, REFERENCE IS MADE TO APPENDIX I OF THIS MANUAL. HEAT TRANSFER IN SOILS INVOLVING PHASE CHANGE OF PORE WATER IS AN EXTREMELY COMPLEX PROCESS AND DEFIES A RIGOROUS MATHEMATICAL TREATMENT. THE METHODS PRESENTED HEREIN ARE SIMPLIFIED PROCEDURES DEVELOPED FOR THE SOLUTION OF ENGINEERING DESIGN PROBLEMS. SEVERAL ASSUMPTIONS HAVE BEEN MADE IN DEVELOPING PRACTICAL METHODS OF CALCULATING DEPTHS OF FREEZE OR THAW IN SOILS: IT IS ASSUMED THAT EACH LAYER OF MATERIAL IS HOMOGENEOUS AND ISOTROPIC, AND THE AVERAGE THERMAL PROPERTIES OF FROZEN AND UNFROZEN SOILS ARE APPLICABLE. UNLESS SPECIFIC DATA ARE AVAILABLE, IT IS ALSO ASSUMED ALL SOIL WATER IS CONVERTED TO ICE, OR ALL ICE IS CONVERTED TO WATER, AT A TEMPERATURE OF 32 DEGREES F. THIS LATTER ASSUMPTION IS SUBSTANTIALLY CORRECT FOR COARSE- GRAINED SOILS BUT ONLY PARTIALLY TRUE FOR FINE-GRAINED SOILS. /AUTHOR/

  • Supplemental Notes:
    • Technical MANUAL TM 5-852-6, 89 PP
  • Corporate Authors:

    Government Printing Office

    Superintendent of Documents
    Washington, DC  USA  20402-9325

    U.S. Army

    ,    

    Air Force Department /US

    ,    
  • Publication Date: 1966-1

Subject/Index Terms

Filing Info

  • Accession Number: 00237429
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 16 1994 12:00AM