Construction of Mat or Raft Foundations
Where and why are raft foundations used?
Raft foundation is generally used to support structures like residential or commercial buildings where soil condition is poor, storage tanks, silos, foundations for heavy industrial equipment etc.
What is raft foundation preferred?
a) Raft foundations are preferred in areas with poor soil bearing capacity, uneven settlement, and the presence of mixed soil types. These foundations achieves the load-bearing capacity through the distribution of stresses to a larger area.
What is the minimum depth of raft foundation?
The minimum thickness of raft foundation is 300mm.
What is foundation spread?
Spread foundations are foundations at shallow depths of burial where the ground resistance on the sides of the foundation does not contribute significantly to the bearing resistance. Some of the provisions in this Section may also apply to deep foundations, such as caissons and piers [C6.
What is the difference between strip and raft foundations?
Strip foundation is used to support a line of loads such as load-bearing walls. … Raft foundation consists of a concrete slab which extends over the entire loaded area so that loads from entire structure are spread over a large area leading to a reduction of the stress of foundation soils is reduced.