What is raft foundation, Civil Engineering

Assignment Help:

Q. What is Raft Foundation?

A raft or mat is combined footing that covers the entire area beneath a structure and supports all the walls and coloumn when the allowable soil pressure is low or the building loads are heavy the use of spread footing would cover more than one half of the area and it may prove more economical to use mat or raft foundation. They are also used where the soil mass contains compressible lenses or the soil is sufficiently erratic so that the differential settlement would be difficult. Raft foundation is also used to reduce settlement above highly compressible soil by making the weight of structure and raft approximately equal to the weight of the soil excavated. Ordinary rafts are designed as reinforced concrete flat slab.


Related Discussions:- What is raft foundation

Determine the grade rod reading at station, A section view of a proposed ro...

A section view of a proposed roadway is shown in Figure 1 with an existing grade point elevation of 100-ft. The proposed roadbed finish grade elevation at station 50+00 is 95.00-ft

Surveying, define principles of survey

define principles of survey

State the angle of inclination of the failure plane, The stresses at failur...

The stresses at failure on the failure plane in a cohesionless soil mass were: Shear stress = 4 kN/m 2 ; normal stress = 10 kN/m 2 . Verify the resultant stress on the failure plan

Mechanics of structure, distinush between determinant and indeterminant pla...

distinush between determinant and indeterminant plane trusses

Curved beams, Sir how can we find location of neutral axis for a curved bea...

Sir how can we find location of neutral axis for a curved beam of circular cross section,,,

State the effect of friction for a straight tendon, State the effect of fri...

State the effect of friction for a straight tendon The length effect represents the effect of friction for a straight tendon due to slight imperfections of the duct. In practic

Chemistry, What are plastics ?give their importance

What are plastics ?give their importance

Arrangement of piles in a pile cap to reduce bending moment, Arrangement of...

Arrangement of piles in a pile cap to reduce bending moment induced in piles Let's consider that piles are designed to intersect at a single common point in a pile cap. The re

FOUNDATION, TYPE OF FOUNDATION IN LATERITE SOIL

TYPE OF FOUNDATION IN LATERITE SOIL

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd