Abstract
An empirical method for predicting the shaft resistance of driven pre-formed piles in sand is presented, derived from a database of 25 tension tests. It is based on the experimental observation that the average shear stress over the pile shaft in a uniform soil deposit reaches a quasi-constant value for pile penetrations greater than a certain critical depth. This approach is contrasted with conventional methods of design, which are shown to be erroneous. The proposed method enables a profile of local shear stress with depth, and hence the shaft resistance, to be obtained in any layered sand deposit, and it is recommended to practising engineers as a simple design tool. Although probably conservative for compression piles in loose sand, it compares favourably with more sophisticated methods of design. (A)
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