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Lecture28-Anchored-in-Granular

# Lecture28-Anchored-in-Granular - Foundation Engineering...

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Foundation Engineering Lecture 28 Anchored Sheet-pile Walls in Granular Backfills L. Prieto-Portar 2009

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Example 3. Free-Earth Support Method for Anchored Sheet-pile Walls in Granular Soils. Select an appropriate steel sheet-pile section and its total length L to retain a sand backfill for the conditions shown below without an anchoring system. Sand backfill : 110 60 34 0 28 65 34 5 0 26 6 63 a ' ' a p pcf ' pcf K . In situ medium sand : ' pcf ' . K . and K . γ γ φ γ φ = = = ° = - = = ° = =
Step 1. Determine the pressures on the wall. ( )( )( ) ( ) ( )( )( ) [ ] ( )( ) ( )( ) ( ) ( ) ( ) ( ) 1 1 2 1 1 1 1 110 10 0 28 308 308 60 26 0 28 308 437 745 110 10 60 26 0 26 692 65 6 37 414 B a C B w a ' C w a E p a p H K . psf p p H K . psf p H H K . psf p D K K D . D Determine the pressure on the wall from the surcharge, a ) above point C : p γ γ γ γ γ γ = = = = + = + = + = ° ± = + = + = ² ³ = - = = ( )( ) 300 300 0 28 84 K . psf = = = surcharg ( )( ) ( ) ( )( ) 300 300 0 26 78 4 0 0 111 36 0 55 0 55 2 000 1 100 e a ' surcharge a H b ) below point C : p K . psf Determine the pressure on the wall due to the line load , K . using Lecture #18 theory, m . H p . Q . , , lbs with its resultant at = = = = = = = = = = ( ) ( )( ) 0 60 0 60 36 21 6 . H . . feet from the dredge line = =

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Locating the point y, The resultant forces from the pressures are, ( )( ) ( )( ) 1 1 2 1 1 10 308 1 540 2 2 26 308 8 008 1 1 B w B P H p
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