UNCERTAINTY ANALYSIS OF RELATIVE DENSITY

The discussion notes that the credibility of relative density results is no better or worse than that of any other routine soil test provided that the tests are performed faithfully in accordance with the standard test procedures, and provided that these test procedures are sufficiently well defined and prevent significant variations in performance. Individual laboratories might find satisfactory relationships between SPT and relative density. Figures showing actual field densities plotted against SPT in nature and compacted dune sand are presented. A quarter of a century of use of the Earth Manual SPT procedures have resulted in buildings settling predictably in a satisfactory manner. The authors reply to the comments made by the discussers, and note that due to the nature of the equation used, the small uncertainities associated with the measuring of maximum, minimum and inplace dry densities are amplified considerably when calculating the relative density. This is true even when the uncertainity associated with the inplace dry density is neglected. When the latter is considered, the uncertainity in the relative density is considerably larger. Comments on the errors in the SPT value evaluation made by de Mello are noted.

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Filing Info

  • Accession Number: 00322662
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 15702
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM