The construction of piles by driving method causes an increase in density of the surrounding soils. Hence, for loose soils this results in improved compaction of soils between the piles.
The sum of the capacities of all piles as a whole is generally greater than the sum of individual pile capacities provided that the effect of pile spacing is not taken into account. However, for bored piles the boring operation induces considerable stress relief and this causes a substantial reduction in shear strength of soils.
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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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