The use of pile foundations is inevitable during following conditions:
- At the time when the strata at or just beneath the ground surface is greatly compressible and very weak or loose for carrying the load transferred from the structure above.
- When the plan of the structure is irregular relative to its outline and load distribution. This may lead to the unpleasant non-uniform settlement when the shallow foundation is constructed. Thus, a pile foundation eliminates differential settlement.
- The pile foundations are perfect for transmission of different structural loading/forces via deep water to the firm stratum below.
- The pile foundations are proficiently used to withstand the horizontal forces as well as supports. The vertical forces/loads in the earth retaining structures and tall structure which are subjected to horizontal forces of wind and earthquake.
- The plies are extremely useful when the soil conditions are in very loose/weak conditions that a washout, erosion and scour of soil underneath leads to the collapse of shallow foundations.
- The piles are used for the foundations of some structures, such as transmission towers, off-shore platforms, which are subjected to uplift.
- In expansive soils like black cotton soil, that swells or shrinks when the ware content varies, the piles are used to transfer the load below the active zone.