Lecture27-Cantilevered-Sheet-pile-Walls

# Lecture27-Cantilevered-Sheet-pile-Walls - Foundation...

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Unformatted text preview: Foundation Engineering Foundation Engineering Lecture 27 Lecture 27 Cantilevered Sheet-pile Walls he Free rth support method for: The Free-earth support method for: a) Granular soils b) Cohesive soils L. Prieto-Portar 2009 Example 1. Free-earth Support Method for Granular Soils. Select an appropriate steel sheet-pile section and its total length L to retain a medium sand backfill for the conditions shown below without an anchoring system. 115 65 ' pcf pcf γ γ = = 35 0 27 6 56 a p therefore K . and K . φ = ° = = Step 1. Determine the pressures on the wall. ( )( )( ) ( ) ( )( ) ( ) ( ) 1 2 1 1 115 14 027 435 435 65 027 435 176 65 629 435 A a A A a E p a A p HK . psf p p DK . D . D p D K K p D . γ γ γ = = = = + = + = + =-- =- ( ) ( ) ( )( )( ) 409 435 65 629 115 14 656 409 10 560 J p a p D p D K K HK D . . D , γ γ γ γ γ γ γ γ =- =- + = + = + Step 2. Determine the depth of embedment D . The procedure will follow the following steps: a) From statics, find the dimension z shown in the figure of slide #3, b) Assume a value for D , c) Calculate z , d) Use z to check if & M = 0; adjust D for convergence. ( ) ( ) ( ) ( ) ( ) 1 1 2 1 2 1 H F Area BAA Area AAA F Area ECJ Area EAA z D Σ = + +- = ¡ & ¡ & ¡ ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 1 1 2 2 1 1 2 2 1 1 1 2 2 2 2 2 1 2 3 2 6 A A A E J E A E A E J A A E J E D z D Hp p p p p p p Solving for z, p p D Hp z p p M about any point,say F, H D z H p D p p p p & ¡ & ¡ & ¡ + + + +- + = ¢ £ ¢ £ ¢ £ ¤ ¥ ¤ ¥...
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Lecture27-Cantilevered-Sheet-pile-Walls - Foundation...

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