By Bengt H. Fellenius
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Extra info for Basics of Foundation Design
5A chart with the Fig. 3A chart, a difference emerges in implied soil type response: while in the Schmertmann chart the soil type envelopes curve downward, in the Douglas and Olsen chart they curve upward. Zones for sand and for clay are approximately the same in the two charts, however. Fig. 5A Profiling chart per Douglas and Olsen (1981) November 2009 Fig. 5B The Douglas and Olsen profiling chart converted to a Begemann type chart Page 2-6 Chapter 2 Soil Profiling with the Cone Penetrometer A comparison between the Schmertmann and Douglas and Olsen charts (Figs.
The direct numerical values produced by the test have been used as input to geotechnical formulae, usually of empirical nature, to determine capacity and settlement, and for soil profiling. Early cone penetrometers gave limited information that could be used for determining soil type and were limited to determining the location of soil type boundaries. The soil type had to be confirmed from the results of conventional borings. Empirical interpretations were possible but they were limited to the geological area where they had been developed.
Sand to gravelly sand 8. Sand – clayey sand to “very stiff” sand 9. Very stiff, fine-grained, overconsolidated or cemented soil The two first and two last soil types are the same as those used by Robertson et al. (1986) and Types 3 through 7 correspond to former Types 3 through 10. The Robertson (1990) normalized profiling chart has seen extensive use in engineering practice (as has the Robertson et al. 1986 chart). The normalization is professedly to compensate for that the cone resistance is influenced by the overburden stress.
Basics of Foundation Design by Bengt H. Fellenius