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Download PDF by N.E. Simons and B.K. Menzies (Auth.): A Short Course in Foundation Engineering

By N.E. Simons and B.K. Menzies (Auth.)

ISBN-10: 0408002956

ISBN-13: 9780408002950

Even supposing there are actually lots of computing device programmes for fixing all types of starting place layout difficulties, the necessity to cost those outputs via 'hand-calculation' has turn into extremely important. This publication concentrates on getting the basics correct after which utilizing them in functional applications.

The e-book is illustrated with a variety of labored examples and with quick-reference tables and charts

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Additional resources for A Short Course in Foundation Engineering

Sample text

1 Example of gross and net pressures The bearing capacity of a soil is related to shear failure in the ground. For foundations on clays, the undrained shear strength is usually the controlling factor, because clays are of low per­ meability and the construction of the structure generally occurs under undrained conditions. The clay will then consolidate with time, gain strength and so the bearing capacity will increase with time. The end of construction case is almost always critical. Granular soils are of high per­ meability, however, and by the end of construction, the drained condition has already been reached.

2) where p = initial effective overburden pressure at foundation level, p = initial total overburden pressure at foundation level, and γ' = submerged unit weight. If the ground water table is low then the equation can be written: qf = c'. 3) When using the bearing capacity equation to solve a problem in practice, it is necessary to consider whether the material is so permeable that the excess pore pressures dissipate immediately the load is applied, that is, consolidation and gain in strength are complete at the end of the con­ struction period, or whether the permeability is so low that very little pore pressure dissipation occurs during construction, no gain in soil strength can be relied upon and the condition is essentially undrained.

Deformation of an element of soil is a function of a change ineffective stress, not a change in total stress. Various causes of deformation of a structure are listed as follows: • • • • • • • • • • • • Application of structural loads Lowering of the ground water table Collapse of soil structure on wetting Heave of swelling soils Fast growing trees on clay soils Deterioration of the foundation (sulphate attack of concrete, corrosion of steel piles, decay of timber piles) Mining subsidence Sinkholes Vibrations in sandy soils Heave of clay soils after clearance of trees Seasonal moisture movements The effects of frost action.

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A Short Course in Foundation Engineering by N.E. Simons and B.K. Menzies (Auth.)

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