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Factors of Safety for Cantilevered Sheet Pile Walls

Courses > Foundation Analysis and Design > Sheet-pile Walls: Cantilevered and Anchored > Factors of Safety for Cantilevered Sheet Pile Walls


Introduction on Factors of Safety for Cantilevered Sheet Pile Walls :

Methods to apply a factor of safety to the geotechnical design of a cantilevered sheet pile wall are described here. For types and design processes see Sheet Pile Walls Topic.

 


Concepts and Formulas of Factors of Safety for Cantilevered Sheet Pile Walls:

There are usually three methods:

 

Factored depth of embedment

This is the method mostly used in practice due to its simplicity and easiness; calculate the value of the depth of embedment (D) using static equilibrium and the best estimate of strength parameters (φ, c). Then, calculated value of D is arbitrarily increased by 20 to 60%:

D_{design}=(1.2; to ; 1.6)D_{calculated}

usually 1.2 - 1.4 for granular soils

usually 1.4 - 1.6 for cohesive soils

Round up D design to next whole foot.

 

Factored earth pressure

In this approach, use factored Kp (called K*p) in place of Kp to determine net pressure diagram:

K^*_p=frac{K_p}{SF}

where 

1.5leq SFleq 2; (usually)

In this approach

D_{design}=D_{calculated}

 

Factored strength parameters

This approach is super conservative; in this approach, use factored strength parameters (φ*,c*) in place of (φ,c) to determine K*p and K*a. 
Determine net pressure diagram using K*p and K*a in place of Kp and Ka: 

phi^*=tan^{-1}(frac{tanphi}{FS})

c^*=frac{c}{FS}

where

1.2leq FSleq 1.5; (usually)

In this approach

D_{design}=D_{calculated}

 


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