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N-value correlation

N-value correlation

N-value correlation

(OP)
Looking for guidance in evaluating/correlating N-values obtained in 1970 for a 140# hammer with a 24-inch drop and a 140# hammer with a 12-inch drop to SPT N-values.  Any suggestions or help would be much appreciated.

RE: N-value correlation

ehill,

There was a thread on this topic not too long ago, although it might have been in one of the other geotechnical fora. Do a search and you should come up with it.

Good Luck,

Jeff

Jeffrey T. Donville, PE
TTL Associates, Inc.
www.ttlassoc.com

RE: N-value correlation

Since the hammer size (and presumably the spoon) is the same - normally, the conversion is to take the ratios of energy. For the 12inch drop, multiply "N12" by 12/30.  For the 24inch drop, multiply "N24" by 24/30.  For different spoon sizes, etc., see chart in Winterkorn and Fang (or now Fang) under the Investigations chapter.

RE: N-value correlation

(OP)
thanks for the help everyone, it is much appreciated.

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