Buchanan Lecture 2019: "Putting Numbers on Geotechnical Judgment"

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This is an interesting lecture. At 56mins, there appears to be reasonably good correlation between the test piles and the shortest piles. I was wondering whether the shortest piles in a group were the early piles driven in that group and perhaps the longer piles were the latter piles driven within a group. If so, it may be that there is some group effect at play here that is not apparent from an individual test pile.