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The performance of piles mainly consists of the two elements, namely ultimate bearing capacity and settlement. The local practice of pile design is place emphasis on checking if the bearing capacity of piles would be exceeded.
Engineers tend to adopt the approach that bored piles are designed to be founded on bedrock while for driven piles they are driven to very stiff stratum with SPT N values greater than 200. Owing to rigid and firm foundation on which the piles are seated, it is therefore assumed that the amount of settlement shall be limited. On the other hand, there is practical difficulty in assessing how much settlements are considered acceptable owing to limited available data.
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
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