sma15 - Stress-Strain Behaviour of Soils Stress-strain...

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Stress-Strain Behaviour of Soils
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Stress-strain response of soils Triaxial tests are the standard means of investigating the stress-strain-strength response of soils. To simplify the presentation only simple shear tests will be considered.
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Stress-strain response of soils Triaxial tests are the standard means of investigating the stress-strain-strength response of soils. To simplify the presentation only simple shear tests will be considered. The simple shear test is an improved shear box test which imposes more uniform stresses and strains.
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Stress-strain response of soils Triaxial tests are the standard means of investigating the stress-strain-strength response of soils. To simplify the presentation only simple shear tests will be considered. The simple shear test is an improved shear box test which imposes more uniform stresses and strains. τ σ dx H dz γ xz γ xz = dx/H ε z = - dz/H = ε v
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The Behaviour of Sands Depends on: Mean Effective stress (Normal effective stress in simple shear)
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The Behaviour of Sands Depends on: Mean Effective stress (Normal effective stress in simple shear) Relative density, I d d I = e - e e - e max max min
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The Behaviour of Sands d I = e - e e - e max max min d s w = G 1 + e γ Depends on: Mean Effective stress (Normal effective stress in simple shear) Relative density, I d
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The Behaviour of Sands d I = e - e e - e max max min d s w = G 1 + e γ d dmin d dmin dmax I = 1 - 1 1 - 1 Depends on: Mean Effective stress (Normal effective stress in simple shear) Relative density, I d
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The Behaviour of Sands τ σ′ τ σ′ = tan φ′ ult CSL γ Dense (D) Medium (M) Loose (L)
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The Behaviour of Sands τ σ′ τ σ′ = tan φ′ ult CSL γ γ ε v Dense (D) Medium (M) Loose (L) D M L
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The Behaviour of Sands τ σ′ τ σ′ = tan φ′ ult CSL γ γ ε v Dense (D) Medium (M) Loose (L) D M L e γ D M L
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All samples approach the same ultimate shear stress and void ratio, irrespective of the initial relative density Initially dense samples attain higher peak angles of friction Initially dense soils expand (dilate) when sheared Initially loose soils compress when sheared The Behaviour of Sands For tests performed with the same normal stress
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The Behaviour of Sands τ σ′ τ σ′ = tan φ′ ult CSL γ D 2 L 2 D 1 L 1
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The Behaviour of Sands τ σ′ τ σ′ = tan φ′ ult CSL γ γ ε v D 2 L 2 D 2 L 2 D 1 L 1 D 1 L 1
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The Behaviour of Sands τ σ′ τ σ′ = tan φ′ ult CSL γ γ ε v D 2 L 2 D 2 L 2 e D 1 L 1 D 1 L 1 σ 1 σ 2
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The Behaviour of Sands τ σ′ τ σ′ = tan φ′ ult CSL γ γ ε v D 2 L 2 D 2 L 2 e D 1 L 1 D 1 L 1 σ 1 σ 2 τ σ′ τ σ′ = tan φ′ ult CSL γ D 2 L 2 D 1 L 1 σ
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The ultimate values of shear stress and void ratio depend on the applied normal stress The ultimate stress ratio and angle of friction are independent of density and stress level Initially dense samples attain higher peak angles of friction, but the peak friction angle decreases as the stress
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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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sma15 - Stress-Strain Behaviour of Soils Stress-strain...

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