Ultimate Bearing Capacity (Qu)Directly beneath the foundation, that is the least amount of shear pressure which will cause the supporting soil to collapse.
Define Bearing Capacity FailuresDefining bearing capacity failure as the failure of a foundation caused by more stress than the soil can withstand is a difficult task. General shear failure, local shear failure, and punching shear failure are the three main types. A base failure occurs when the shear strength of the soil exceeds the bearing capacity of the soil. That refers to as a failure of bearing capacity.
Types of Bearing Capacity Failures
General Shear Failure
Strip footings rest on loose sand or soft clay. Shear failure occurs in the soil at that load, and the failure surface extends to the ground surface. General shear failure occurs when this occurs. There is always a heave on the sides in general shear failures.
The edge of the base and the ground surface form a continuous, well-defined, and distinct surface of failure. Dense or rigid soils are more susceptible to this loss. The sheer mass surrounding the foot is constantly bulging. The foot tilts when the failure occurs.
We observe considerable soil compression under the foundation as well as the partial formation of the plastic balance. It does not fail immediately, and the foundation does not tilt.
A minor bulging of the soil at the foundation is found where the weak surface does not meet the surface of the earth. That may be indicative of a surface failure. Significant anomalies indicate failure. With a sharp curve top, failure is abrupt and devastating. It goes beyond the foot's edge for a long distance. Plastic balance first appears at the toe edge and extends outward.
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