Pile Foundation: Part 1: Why do we provide Deep Foundation ?

This is first video on a pile foundation, discussing introduction to deep foundation and necessity of deep foundation.
Deep foundations are employed when the soil strata immediately beneath the structure are
not capable of supporting the load with tolerable settlement or adequate safety against shear
failure. Merely extending the level of support to the first hard stratum is not sufficient, although this is a common decision that is reached. Instead, the deep foundation must be engineered in the same way as the shallow foundation so that the soil strata below remain safe and
free of deleterious settlement.
Two general forms of deep foundation are recognised:
1. Pile foundation
2. Pier, caisson or well foundation.
Piles are relatively long, slender members that are driven into the ground or cast-insitu. Piers, caissons or wells are larger, constructed by excavation and are sunk to the required
depth; these usually permit visual examination of the soil or rock on which they rest. In effect
they are deep spread footings or mats. They are normally used to carry very heavy loads such
as those from bridge piers or multi-storeyed buildings. A sharp distinction between piles and
piers is impossible because some foundations combine features of both

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