sma10 - Consolidation The consolidation process Pore...

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Consolidation
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Skeletal Material (incompressible) Pore water (incompressible) Voids Solid Initial State The consolidation process
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Skeletal Material (incompressible) Pore water (incompressible) Voids Solid Voids Solid Initial State Deformed State The consolidation process Water + ∆ σ
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Deformation of saturated soil occurs by reduction of pore space & the squeezing out of pore water. The water can only escape through the pores which for fine-grained soils are very small The consolidation process
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Deformation of saturated soil occurs by reduction of pore space & the squeezing out of pore water. The water can only escape through the pores which for fine-grained soils are very small The consolidation process Effective soil skeleton “spring” water water squeezed out
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The consolidation process water ∆σ Instantaneously no water can flow, and hence there can be no change in volume.
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The consolidation process water ∆σ Instantaneously no water can flow, and hence there can be no change in volume. For 1-D conditions this means ∆ε zz = ∆ε v = = 0 (1)
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The consolidation process water ∆σ Instantaneously no water can flow, and hence there can be no change in volume. For 1-D conditions this means ∆ε zz = ∆ε v = = 0 (1) and hence ∆σ ´ = 0 instantaneously
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The consolidation process water ∆σ From the principle of effective stress we have ∆σ = ∆σ ´ + u (2) and thus instantaneously we must have ∆σ = ∆ u
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Region of high excess water pressure Region of low excess water pressure Flow The consolidation process The consolidation process is the process of the dissipation of the excess pore pressures that occur on load application because water cannot freely drain from the void space.
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Total Stress Time The consolidation process
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Total Stress Time Time Excess Pore Pressure The consolidation process
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Effective Stress Time The consolidation process
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Effective Stress Time Settlement Time The consolidation process
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v v z z z z + Plan Area A Elevation v z z Derivation of consolidation governing equation 1. Water flow (due to consolidation)
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v v z z z z + Plan Area A Elevation v z z Rate at which water leaves the element v z zA Derivation of consolidation governing equation 1. Water flow (due to consolidation)
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∂ε v t zA Rate of volume decrease Derivation of consolidation governing equation 2. Deformation of soil element (due to change in effective stress) Plan Area A Elevation z
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Rate at which water leaves the element
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This note was uploaded on 08/30/2011 for the course CIVL 2410 taught by Professor Dairey during the Three '11 term at University of Sydney.

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sma10 - Consolidation The consolidation process Pore...

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