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Is Hiley’s formula suitable for estimating capacities all driven H-piles?

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In Hong Kong, the local practice of driven H-piles is to adopt dynamic formula like Hiley’s Formula to drive piles to set and verify its capacity by static load test for a certain proportion of these piles.

However, in long piles and in some special ground conditions, the capacity of piles predicted by Hiley’s Formula is not on a conservative side. To address these problems, static load tests can be carried out to determine shaft resistance of H-piles and these data is used for designing the pile lengths. When the piles are actually driven into ground, it capacity can then be checked by adopting dynamic load testing such as PDA test. Alternatively, wave equation analysis can be used for estimating the soils resistance of the ground and the pile penetration required.

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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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