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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…

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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…

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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…

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Foundations on Rock

Rocks encountered in nature might be igneous, sedimentary or metamorphic. Granite and basalt belong to the first group. Granite is primarily composed of feldspar, quartz and mica possesses a massive structure. Basalt is a dark-colored fine grained rock. Both basalt and granite under unweathered conditions serve as a very good foundation base. The most important  Full Article…

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Bearing Capacity of Foundations on Top of a Slope

There are occasions where structures are required to be built on slopes or near the edges of slopes. Since full formations of shear zones under ultimate loading conditions are not possible on the sides close to the slopes or edges, the supporting capacity of soil on that side get considerably reduced. Meyerhof (1957) extended his  Full Article…

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The CPT Method of Determining Ultimate Bearing Capacity

Cohesionless Soils Relationship Between qc, Dr and 0 Relationships between the static cone penetration resistance qc and 0 have been developed by Robertson and Campanella (1983b), Fig. 9.15. The value of $ can therefore be determined with the known value of q . With the known value of 0, bearing capacity factors can be determined and  hence  Full Article…

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