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Factor of safety for cantilver Pile Retaining Walls

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The geotechnical engineer includes a factor of safety of about 1.5 for the 
allowable passive lateral earth pressure used for designing embedment 
restraint of cantilever piles.  based on information from the geotechnical 
engineers I work with, an additional factor of safety on top of that value is 
not required, and typically not added by engineers in the design of 
cantilever pile systems. 
paul franceschi, S.E.