In designing charts or while developing various construction techniques for small-diameter sand drains, it is assumed that the water-carrying capacity of sand drain is sufficient to drain out all water that is being squeezed out of the clay stratum. This assumption may not be valid for highly compressible clays and for clays where field permeability in the horizontal direction is very large due to seams of silt and sand. The purpose of this technical note is to give design charts for testing the significance of well resistance. The possiblity of reduction in the degree of consolidation due to the incapability of the smaller-diameter sand drains to drain off all water squeezed out of the consolidating soft clay stratum is also examined. A procedure for checking the significance of well resistance is furnished and an illustration is presented. /Author/

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  • Accession Number: 00194287
  • Record Type: Publication
  • Source Agency: American Society of Civil Engineers
  • Report/Paper Numbers: ASCE 14496
  • Files: TRIS
  • Created Date: Jul 11 1979 12:00AM