Mat Slab Foundation Design

The bearing capacity increased by combining all individual footings in to one mat since bearing capacity is proportional to width and depth of foundations.

Mat slab foundation design.

It is used where the supporting soil has low bearing capacity. Mat foundation is constructed as a large slab which works as the base for the building. Typically reinforced with a double layer of rebar throughout its pad a mat slab is capable of bearing loads at virtually any point and distributing heavy loads across an expanse of weak subsoil. Two way slab and beam.

Though little known 10 years ago today mat slabs are a standard solution for building sites with difficult soil conditions. The building then rests on this foundation leading to lesser contact with the land and hence more strength and stability. Although mat foundations are more difficult and more costly to design than individual spread footings they can be used effectively. A mat foundation is a thick reinforced concrete slab supporting arrangements of columns or walls in a row or rows and transmitting the loads to the soil.

A mat foundation also may be used to resist hydrostatic pressures or to bridge over small soft spots in the soil provided the mat is adequately reinforced. In this type of mat foundation beams are placed in perpendicular directions and all the beams are connected by rcc slab. The columns are placed on the intersection of beams. The mat foundation is also reinforced with many bars inside it which run perpendicular to each other.

Mat or raft foundation is a large concrete slab supporting several columns in two or more rows.