Raft foundation are extremely useful to create basement apartment in structure as, the whole area, which cover the structure, is excavated. Thus, Raft foundation is used where there is Marshy land, softened soil made due to sanitary fill, debris, unconsolidated soil, and sandy soil. The mat foundation is moreover very useful for equal settlement and prevents differential settlement. So that with the help of a large base area of such foundation, stress to the ground is reduced compared to a small area of the individual footing and pile footing.
In addition, from the point of geotechnical-engineering such foundation should be used where the allowable bearing capacity of the soil is low. The structure where the wall and column are so close footing touches each other, mat foundation is prefer. Why and where to use mat foundation?Īs explained, they are extensional of individual footing, these foundation are generally economical to provide when the isolated footing area is more than 50% of the total area of structure. Due to the very large width, the bearing capacity of such a foundation is very high so that shear fails or bearing failure does not occur. This mat foundation is formed by integrating two or more individual foundations.
