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  1. crownmethod

    Trouble understand SPT N values

    Hi all I am having some trouble interpreting some of the SPT results I have obtained from some boreholes. I have SPT results in various formats which is confusing me. These are my thoughts on the results I have: N = 5/9/15 <==== obviously N = 15 + 9 = 24 N = 25/- <==== what does this mean? I...

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