Explain Driven pile foundation.
Explain Driven pile foundation.
Driven piles, also known as displacement piles, are a commonly used form of deep foundation that provide support for structures, transferring their loads to layers of soil or rock that have sufficient bearing capacity with limited settlement. If during installation a large volume of soil is displaced laterally or upward is basically known as displacement pile.
In loose sand, driven piles densify the sand up to a distance of 3.5 times the diameter of pile measured from the center of pile. This compaction leads to increase in the shearing resistance within the zone of influence. In case of clays, large displacement piles remolds the soil to a distance of 2 times the diameter of pile.
During pile driving, high pore water pressures are setup around the pile. Soil regains its strength only after a period of time when excess pore water pressure has dissipated.
Driven piles are basically preferred in loose to medium sand and least preferred in case of clays and dense sand. Example of large displacement piles are driven cast-in-situ piles, driven prestressed piles, steel piles as well as timber piles.
There are small displacement piles also, such as rolled steel section piles, screw piles and open ended hollow sections piles are examples of small displacement piles. Small displacement piles are generally used when ground displacement and ground disturbances are to be minimized.
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