SPT AND RELATIVE DENSITY IN COARSE SANDS AND DRILL ROD INFLUENCE ON STANDARD PENETRATION TESTS

The discusser comments on the authors' position in which, although the standard deviations of SPT values at the different depths range as high as 20%-60% of the respective average values, the "average" values within the specific depth ranges are compared to postulate that the rod type is not relevant. It is noted that wave equation analyses either support the importance of rod length or deny it, but the greater variability at very shallow depths continues to in interfere with the principal user and research on SPT hitherto reported. The discusser suggests that SPT is predominantly a function of in-situ shear resistance. The discusser also suggests avoiding extreme value statistics, and comments on the adoption of an idealized pile point resistance on the USBR data. It is also noted that a noticeable added effect may derive as a function of time of permanence of the overconsolidating stress, affecting the comparisions of laboratory and in-situ investigations.

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  • Accession Number: 00194177
  • Record Type: Publication
  • Report/Paper Numbers: ASCE
  • Files: TRIS
  • Created Date: Aug 15 1979 12:00AM