shallow foundations 5

shallow foundations 5 - Shallow Foundations 5 Foundation...

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Shallow Foundations 5 Foundation Design CE 482
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Review Immediate (“elastic”) settlement General form based on stiffness Improved methods account for: Foundation rigidity Embedment depth of foundation Increase in soil stiffness with depth Location of rigid layers
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Overview of Consolidation Excess pore pressures caused by undrained loading Change in loading or boundary conditions that takes place in a short time compared to time required for pore pressure dissipation As soon as loading is complete, water begins to flow following gradient caused by the excess pore pressures – leading to change in volume If excess pore pressures are positive – soil decreases in volume – consolidation If excess pore pressures are negative – soil increases in volume – swell/heave
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Overview of Consolidation Mathematical theory describing the dissipation of excess pore pressures is called Consolidation Theory The process of consolidation/swell is governed by: Equations of equilibrium for an element of soil Stress-strain relations for the mineral skeleton Continuity equation for the pore fluid
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shallow foundations 5 - Shallow Foundations 5 Foundation...

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