Abstract
A discussion of an article with the aforementioned title, published in this journal (Vol. 9, No. 5, September/October 2004), is presented. The authors of the original paper mentioned the difficulty of determining the point at which a pile becomes fixed. The length to fixity is the distance below the ground surface at which the pile becomes vertical. Using the principle of least work proposed by Cummings (1937) and Castigliano's second theorem, the discusser derives six equations for the length to fixity under various soil and pile conditions. Calculations made using these equations show good agreement with measured results.
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