Mats on Sand Because the differential settlements of a mat foundation are less than those of a spread foundation designed for the same soil pressure, it is reasonable to permit larger safe soil pressures on a raft foundation. Experience has shown that a pressure approximately twice as great as that allowed for individual footings may Full Article…

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# The Coefficient of Subgrade Reaction

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

# Case History of Failure of the Transcona Grain Elevator

One of the best known foundation failures occurred in October 1913 at North Transcona,Â Manitoba, Canada. It was ascertained later on that the failure occurred when the foundationÂ 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…

# 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…

# 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…

# 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…

# Ultimate Bearing Capacity of Footings Resting on Stratified Deposits of Soil

All the theoretical analysis dealt with so far is based on the assumption that the subsoil is isotropic and homogeneous to a considerable depth. In nature, soil is generally non-homogeneous with mixtures of sand, silt and clay in different proportions. In the analysis, an average profile of such soils is normally considered. However, if soils Full Article…

# 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 byÂ Robertson and Campanella (1983b), Fig. 9.15. The value of $ can therefore be determined with theÂ known value of q . With the known value of 0, bearing capacity factors can be determined and Â hence Full Article…

# Ultimate Bearing Capacity of Footings Based on SPT Values (N)

Standard Energy Ratio Res Applicable to N Value The effects of field procedures and equipment on the field values of N were discussed in Chapter 9. The empirical correlations established in the USA between N and soil properties indicate the value of N conforms to certain standard energy ratios. Some suggest 70% (Bowles, 1996) and Full Article…

# Bearing Capacity of Foundations Subjected to Eccentric Loads

Foundations Subjected to Eccentric Vertical Loads If a foundation is subjected to lateral loads and moments in addition to vertical loads, eccentricity in loading results. The point of application of the resultant of all the loads would lie outside the geometric center of the foundation, resulting in eccentricity in loading. The eccentricity e is measured Full Article…