SETTLEMENT OF THAWING EMBANKMENT--TECHNICAL NOTE

This paper which shows that thaw-settlement of an embankment constructed on frozen sandy soil can be approximated using conventional elastic solutions, supports its observations obtained from field measurements of settlements that occurred in a test embankment constructed in the winter of 1975. It is also shown that thaw-settlement will be significantly influenced by the modulus of elasticity which must reflect the prethaw conditions of unit weight and moisture content. During construction (sequence is briefly outlined), settlement plates and surface markers were installed. The embankment settlement was not constant throughout the fill area. Determination of embankment settlement by elastic methods is dependent on the modulus of elasticity and Poisson's ratio. The modulus of elasticity was estimated using a constrained modulus obtained from laboratory consolidation tests, and an estimated Poisson's ratio. The results are tabulated of embankment settlement calculations based on an equation by Poulos and Davis for the determination of settlement of embankment constructed over a rigid base of unfrozen soil. Comparison of the calculated and measured values shows that the values are close. A finite element program (FEAST) was used to calculate the settlement at the surface. The study shows that the modulus of elasticity has a significant influence on settlement, and that Poisson's ratio has a minor effect on settlement.

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  • Accession Number: 00141058
  • Record Type: Publication
  • Report/Paper Numbers: ASCE #12287
  • Files: TRIS
  • Created Date: Oct 6 1976 12:00AM