Why pile foundation is required

It would be good to pay attention to the soil-pile interference. Something to consider would be to seek professional help in a project like this to ensure quality work and to enhance safety. Your email address will not be published. Notify me of follow-up comments via e-mail address. Save my name, email, and website in this browser for the next time I comment. Notify me of follow-up comments by email. Notify me of new posts by email. The following list identifies some of the conditions that require pile foundations: Conditions That Require the Use of Pile Foundation 1.

Compressible or Weak Upper Soil Layer When one or more upper soil layers are highly compressible and too weak to support the load transmitted by the superstructure, piles are used to transmit the load to underlying bedrock or a stronger soil layer, as shown in Figure-a. See Figure-b Fig-a Fig-b 2. Presence of Horizontal Forces When subjected to horizontal forces see Figure-c , pile foundations resist by bending, while still supporting the vertical load transmitted by the superstructure.

Fig-c 3. Presence of Expansive Soils In many cases, expansive and collapsible soils may be present at the site of a proposed structure. Fig-d 4. Subjected to Uplifting Forces The foundations of some structures, such as transmission towers, offshore platforms, and basement mats below the water table, are subjected to uplifting forces.

See Figure-e Fig-e 5. Soil Erosion Bridge abutments and piers are usually constructed over pile foundations to avoid the loss of bearing capacity that a shallow foundation might suffer because of soil erosion at the ground surface. Fig-f Share this:. Tags: Foundation , Pile Foundation. No Comments Aug 2, However, pile foundations may be considered as an alternative when pies are extended beyond the active zone, which swells and shrinks figure 4.

Soils such as loess are collapsible in nature. When the moisture content of these soils increases, their structures may break down. A sudden decrease in the void ratio of soil induces large settlements of structures supported by shallow foundations.

In such cases, piles foundations may be used in which piles are extended into stable soil layers beyond the zone of possible moisture change. Foundations of some structures, such as transmission towers, offshore platforms, and basement mats below the water table, are subjected to uplifting forces.

Piles are sometimes used for these foundations to resist the uplifting force figure 5. Bridge abutments and piers are usually constructed over pile foundations to avoid the possible loss of bearing capacity that a shallow foundation might suffer because of soil erosion at the ground surface figure 6.

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