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pile work increase the bearing capacity of soil
The purpose of pile work is as easy as that ,when strata beneath the surface is very weak and compressible then pile foundation is used to provide adequate strength and support to the soil in order to handle large superimposed load of structure to be built above it.
Pile foundations are recommended when the soil bearing capacity at shallow depth cannot withstand the heavy structural loads like from buildings, bridges, towers and heavy structures. These foundations also functions as a roots that stabilizes the structures from movements due to earthquakes.
Piles foundation recomend if the soil bearing capacity can not resist the load.
Simply to avoid extra excavation in terms of saving time & cost. Easy to get specific depth.