What is pile raft foundation?

A piled raft foundation combines two foundation-building techniques into a hybrid design suitable for specialized circumstances. Piles are columns extending below the ground surface that connect at the top of the building. A piled raft foundation uses both methods to support the building.Click to see full answer. Also question is, what is the difference between pile foundation and raft foundation?The raft foundation or mat foundation is a prominent example of a shallow foundation. On the other hand, the pile foundation is an example of a deep foundation. This is one of the first and the most general point of difference between these two types of foundations. what are pile foundations? Pile foundation , a kind of deep foundation, is actually a slender column or long cylinder made of materials such as concrete or steel which are used to support the structure and transfer the load at desired depth either by end bearing or skin friction. Pile foundations are deep foundations. Also question is, what is cellular raft foundation? Raft foundations are a type of shallow foundation. They are typically formed by reinforced concrete slabs that cover a wide area, often the entire footprint of a building. A cellular raft foundation consists of two slabs with two-way interlocking ground beams.Why do we use pile foundation?Pile foundations are principally used to transfer the loads from superstructures, through weak, compressible strata or water onto stronger, more compact, less compressible and stiffer soil or rock at depth, increasing the effective size of a foundation and resisting horizontal loads.