Abstract
A drilled shaft, also known as drilled pier, drilled caisson, caisson, bored pile, etc., is a versatile foundation system that is used extensively on a worldwide basis. In its simplest form, a drilled shaft is constructed by making a cylindrical excavation, placing a reinforcing cage (when necessary), and then concreting the excavation. With available drilling equipment, shaft diameters up to 20 ft (6 m) and depths exceeding 250ft (76 m) are possible. However, for most normal applications, diameters in the range of 3 to 10 ft (1 to 3 m) are typical. This size versatility allows a single drilled shaft to be used in place of a driven pile group and eliminates the need for a pile cap. In addition, normal construction practices for drilled shafts effectively eliminate the noise and strong ground vibrations that develop during pile driving operations. For these and other secondary reasons, drilled shafts have become both the technical and economic foundation of choice for many design applications. In fact, they have become the dominant foundation type in many geologic settings around the world.
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Kulhawy, F.H. (1991). Drilled Shaft Foundations. In: Fang, HY. (eds) Foundation Engineering Handbook. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-5271-7_14
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DOI: https://doi.org/10.1007/978-1-4757-5271-7_14
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