🕑 Reading time: 1 minuteDeep foundation is required to carry loads from a structure through weak compressible soils or fills on to stronger and less compressible soils or rocks at depth, or for functional reasons. Deep foundations are founded too deeply below the finished ground surface for their base bearing capacity to be affected by surface conditions, this is usually at depths >3 m below finished ground level. Deep foundation can be used to transfer the loading to a deeper, more competent strata at depth if unsuitable soils are present near the surface.
Types of Deep FoundationThe types of deep foundations in general use are as follows:
- Buoyancy rafts (hollow box foundations)
- Shaft foundations
- Pile foundations