301001 Lecture Notes - Lecture 1: Offshore Construction
27 May 2020
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Document Summary
Deep foundations are those foundations which derive their supporting capacity at some depth below the structure, generally df/b 4. These foundations typically extend to depths on the order of 15 m (50 ft) below the ground surface, but they can be much longer, perhaps extending as deep as 45 m (150 ft). Even greater lengths have been used in some offshore structures, such as oil drilling platforms. Since soils usually improve with depth, and this method mobilizes a large volume of soil, deep foundations are often able to carry very large loads. These are selected when structure subsoil system makes a shallow foundation unfeasible for reasons of performance, construction or economy. There are three types of deep foundations (a) piles (b) piers (c) caissons. People use many different names to identify different types of deep foundations. Different individuals often use the same terms to mean different things and different terms to mean the same things.
