Viewing 1 to 10 of 33 items
Archive | Shallow Foundation RSS feed for this section

In this category has 3 Shallow Foundation chapter. Ultimate Bearing Capacity, Safe Bearing Pressure and Settlement calculation and Combined footings and Mat foundations

Floating Foundation

General Consideration A floating foundation for a building is defined as a foundation in which the weight of the building is approximately equal to the full weight including water of the soil removed from the site of the building. This principle of flotation may be explained with reference to Fig. 14.4. Fig. 14.4(a) shows a  Full Article…

0

Design of Mat Foundations by Elastic Plate Method

Many methods are available for the design of mat-foundations. The one that is very much in use is the finite difference method. This method is based on the assumption that the subgrade can be substituted by a bed of uniformly distributed coil springs with a spring constant ks which is called the coefficient of subgrade  Full Article…

0

Design of Mat Foundation by Rigid Method

In the conventional rigid method the mat is assumed to be infinitely rigid and the bearing pressure against the bottom of the mat follows a planar distribution where the centroid of the bearing pressure coincides with the line of action of the resultant force of all loads acting on the mat. The procedure of design  Full Article…

0

Proportioning of Cantilever Footing

Strap or cantilever footings are designed on the basis of the following assumptions: 1 . The strap is infinitely stiff. It serves to transfer the column loads to the soil with equal and uniform soil pressure under both the footings. 2. The strap is a pure flexural member and does not take soil reaction. To avoid  Full Article…

0

The Coefficient of Subgrade Reaction

The coefficient of subgrade reaction is defined as the ratio between the pressure against the footing or mat and the settlement at a given point expressed as The coefficient of subgrade reaction is defined as the ratio between the pressure against the footing or mat and the settlement at a given point expressed as  eq 14.2    Full Article…

0

Case History of Failure of the Transcona Grain Elevator

One of the best known foundation failures occurred in October 1913 at North Transcona, Manitoba, Canada. It was ascertained later on that the failure occurred when the foundation pressure at the base was about equal to the calculated ultimate bearing capacity of an underlaying layer of plastic clay (Peck and Byrant,1953), and was essentially a shearing failure.  Full Article…

0

Bearing Capacity of Rocks

Bearing capacities of rocks are often determined by crushing a core sample in a testing machine. Samples used for testing must be free from cracks and defects. In the rock formation where bedding planes, joints and other planes of weakness exist, the practice that is normally followed is to classify the rock according to RQD  Full Article…

0