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Lecture29-Anchored-in-Cohesive

# Lecture29-Anchored-in-Cohesive - Foundation Engineering...

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Unformatted text preview: Foundation Engineering Foundation Engineering Lecture Lecture 29 29 Anchored Sheet-pile Walls in Cohesive Backfills L. Prieto-Portar 2008 Example 4. Free-Earth Support Method for Anchored Sheet-pile Walls in Cohesive Soils. Find the required anchor force T and sheet-pile length L . 0 33 a Sand backfill =115 pcf and ' =60 pcf =32 K .-situ soft clay γ γ γ γ γ γ γ γ φ °∴ = 1 0 1 0 a a In-situ soft clay =120 pcf and '=65 pcf c=400 psf =0 K . In situ medium soft clay '=65 pcf c=850 psf =0 K . γ γ γ γ γ γ γ γ φ γ φ °∴ =- °∴ = Step 1. Introduce a Factor of Safety for the cohesion. The shear strength of the cohesion is typically reduced through a Factor of Safety of between 1.5 to 2.0. Step 2. Determine the pressures on the wall. 850 500 1 7 measured red c c psf FS . = = = ( )( )( ) 1 115 6 0 33 228 5 6 0 33 60 2 5 0 33 228 50 278 a a B a p HK . psf H H K . . . psf γ = = =- = + = + = ( ) ( )( )( ) ( )( )( ) ( ) ( )( ) ( )( ) ( )( ) ( )( ) ( )( ) ( )( ) ( )( ) ( )( )...
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Lecture29-Anchored-in-Cohesive - Foundation Engineering...

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