6.2Foundation Engineering

In engineering, a foundation is the element of a structure which connects it to the ground, and transfers loads from the structure to the ground. Foundations are generally considered either shallow or deep.

Foundation engineering is the application of soil mechanics and rock mechanics (Geotechnical engineering) in the design of foundation elements of structures.

Purpose

Foundations provide the structure's stability from the ground:

①To distribute the weight of the structure over a large area in order to avoid overloading the underlying soil (possibly causing unequal settlement).

②To anchor the structure against natural forces including earthquakes, floods, frost heaves, tornadoes and wind.

③To provide a level surface for construction.

④To anchor the structure deeply into the ground, increasing its stability and preventing overloading.

⑤To prevent lateral movements of the supported structure (in some cases).

Requirements of a good foundation

The design and the construction of a well-performing foundation must possess some basic requirements:

①The design and the construction of the foundation is done such that it can sustain as well as transmit the dead and the imposed loads to the soil. This transfer has to be carried out without resulting in any form of settlement that can result in any form of stability issues for the structure.

②Differential settlements can be avoided by having a rigid base for the foundation. These issues are more pronounced in areas where the superimposed loads are not uniform in nature.

③Based on the soil and area it is recommended to have a deeper foundation so that it can guard any form of damage or distress. These are mainly caused due to the problem of shrinkage and swelling because of temperature changes.

④The location of the foundation chosen must be an area that is not affected or influenced by future works or factors.

Modern foundation types

Shallow foundations

Shallow foundations, often called footings, are usually embedded about a metre or so into soil. One common type is the spread footing which consists of strips or pads of concrete (or other materials) which extend below the frost line and transfer the weight from walls and columns to the soil or bedrock.

Another common type of shallow foundation is the slab-on-grade foundation where the weight of the structure is transferred to the soil through a concrete slab placed at the surface. Slab-on-grade foundations can be reinforced mat slabs, which range from 25 cm to several meters thick, depending on the size of the building, or post-tensioned slabs, which are typically at least 20 cm for houses, and thicker for heavier structures.

Deep foundations

A deep foundation is used to transfer the load of a structure down through the upper weak layer of topsoil to the stronger layer of subsoil below. There are different types of deep footings including impact driven piles, drilled shafts, caissons, helical piles, geo-piers and earth-stabilized columns. The naming conventions for different types of footings vary between different engineers. Historically, piles were wood, later steel, reinforced concrete, and pre-tensioned concrete.

A monopile foundation is a type of deep foundation which uses a single, generally large-diameter, structural element embedded into the earth to support all the loads (weight, wind, etc.) of a large above-surface structure. Many monopile foundations have been utilized in recent years for economically constructing fixed-bottom offshore wind farms in shallow-water subsea locations. For example, a single wind farm off the coast of England went online in 2008 with over 100 turbines, each mounted on a 4.74-meter-diameter monopile footing in ocean depths up to 16 metres of water.

Foundation Design

Foundations are designed to have an adequate load capacity depending on the type of subsoil/rock supporting the foundation by a geotechnical engineer, and the footing itself may be designed structurally by a structural engineer. The primary design concerns are settlement and bearing capacity. When considering settlement, total settlement and differential settlement is normally considered. Differential settlement is when one part of a foundation settles more than another part. This can cause problems to the structure which the foundation is supporting. Expansive clay soils can also cause problems.

Terzaghi's Analysis 

in Shallow Foundation

Video from Magic Marks

https://www.youtube.com/watch?v=qeyV9-Ri2pc

Quiz

Topic Discussion

References

 Terzaghi, Karl; Peck, Ralph Brazelton; Mesri, Gholamreza (1996), Soil mechanics in engineering practice (3rd ed.), New York: John Wiley & Sons, p. 386, ISBN 0-471-08658-4.

 Offshore Wind Turbine Foundations Archived 2010-02-28 at the Wayback Machine, 2009-09-09, accessed 2010-04-12.

 Constructing a turbine foundation Archived 2011-05-21 at the Wayback Machine Horns Rev project, Elsam monopile foundation construction process, accessed 2010-04-12

 "Lynn & Inner Dowsing Offshore Wind Farms". MT Højgaard. Archived from the original on 20 December 2016. Retrieved 15 September 2016.

https://en.wikipedia.org/wiki/Foundation_(engineering)