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19_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

19_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 -...

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p2 Immediate Settlement (Pi)-=-TJ].sn~ettlement is g,y,e.to,J;otatjonal strainJ<;fLstortion) within tile soil - not a chan e in volume. (Note that if no shear strain, say a blanket loaa, then no Imme late settleiii8nt.) - - Q L Pi r Original Distorted Immediate settlement is typically much smaller in magnitude than p, and occurs rapidly, I.e. during construction. It is affected by: n. fooling ngidity 2. fooling shape 3. location beneath footing 4. soil stiffness parameters E and J.l 5. soil layering .q. presence of rigid layer (rock) o Compute pi Using Theory Of Elasticity Superposition is valid: 1----1 1 For relatively uniform clay strata E and J.l can be assumed constant and, for sufficiently low
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Unformatted text preview: stress levels, elastic theory gives satisfactory estimates of Pi-o Uniformly Loaded Flexible Footing A flexible loaded area deforms into a dish shape, producing a uniform reaction (e.g. a tank). The settlement, pi, under the corner of a flexible rectangular loading is one half of the settlement at the center. Uniform Contact Pressure, q o Rigid Footing A rigid loaded area has a uniform displacement with a contact pressure which increases from the center to a large stress at the edge. The settlement, Pi, under any point of a rigid loaded area is the same. Q Contact Pressure, q Pi...
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