The role of a deep foundation is to transfer the structural load of a building or other structure to deeper, more stable soil or rock below the surface. This is necessary when the upper layers of soil are weak or unstable and cannot support the weight of the structure. A deep foundation provides a more secure base for the building, ensuring that it remains stable and secure over time. Examples of deep foundations include drilled piers, caissons, and driven piles, among others.
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