Types of raft foundation are
1. Solid slab raft
2. Beam and slab raft
3. Cellular rafts
Matt or Raft Foundation Combined Footings Pile Cap Foundations Isolated Foundations Continous Foundation
The most common types of foundations used in black cotton soil in Addis Ababa are raft foundations and pile foundations. Raft foundations distribute the building loads over a larger area to prevent differential settlement on the compressible soil. Pile foundations are used to transfer building loads to deeper, more stable layers of soil, bypassing the weak black cotton soil.
The type of mat foundations include flat plate mat, plate thickened under columns, and two-way beam and slab. The other types are plate with pedestal, rigid frame mat, and piled raft.
The main advantage of a raft foundation is that it is more economical. Another advantage is that it requires little excavation. The disadvantages of raft foundations are that there is a greater potential for erosion, and they require specific treatments to bear a load.
The construction joint should be placed where there is the least amount of impact. This could include the slabs. These types of foundations are used in the United Kingdom and Australia.
The type of mat foundations include flat plate mat, plate thickened under columns, and two-way beam and slab. The other types are plate with pedestal, rigid frame mat, and piled raft.
we can use cement grouting,to mix sand and lime stones and also use pile or raft foundations
A mat or raft foundation is suitable for laterite soil due to its high compressibility and low bearing capacity. These types of foundations help distribute the load evenly and prevent differential settlement in the soil. Additionally, pile foundations can also be a good option for areas with laterite soil to reach a more stable stratum for support.
According to soil condition, load, environmental conditions we need different types of foundations.......
Raft, riverboat and rowboat are boat types. They begin with the letter r.
deep foundation & piles
Using pads minimises costs for the concrete necessary at the same time reduce excavation needed which you would usually use for pile, raft and strip foundations. However they cannot take excessive weight such as a concrete office block or be used on 'fragile ground'