POINT BEARING CAPACITY OF NON-DISPLACEMENT PILES IN HARD CLAY

概要

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This paper discusses the factors used to determine the point bearing capacity of non-displacement piles in hard clay, and proposes a new approach based on a failure mechanism for estimating settlement of a non-displacement pile with tip in hard clay. Model tests were performed in which void ratios as well as undrained shear strength, confining pressure, pile diameters and settlement rates were adopted as the factors determining the point bearing capacity of non-displacement piles in hard clay. The results of the model tests led to the following conclusions : (1) The point bearing pressure-settlement behavior can be divided into three phases. In the first phase, it is linear elastic and can be expressed by the elastic solution for a rigid punch. In the second phase, the hard clay under the pile tip failed in punching shear and in the third phase, it is practically defined to be ultimate ; (2) Void ratio as well as undrained shear strength is one of the factors determining the point bearing capacity because it seriously affects point bearing capacity in the second and third phases. Point bearing capacity doesn't vary significantly however with confining pressure, pile diameters and settlement rates ; and (3) The proposed approach for estimating the settlement of the tip of a non-displacement pile in hard clay is generally consistent with the results of the model tests.
社団法人地盤工学会の論文
1998-06-15