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Foundation depth

Foundation depth

Foundation depth

(OP)

-when the depth of foorting (2 m) is higher than the width (1 m) can the classicaa bearing capacity relation be applied  

RE: Foundation depth

yes

RE: Foundation depth

(OP)
i do not think so because the classical bearing capacity relation developed by Terzaghi was proposed for shallow foundation for which, as Terzaghi defines, the width is smaller or equal to the depth  

RE: Foundation depth

Shouldn't be a big problem.  Typical practice treats the 2 m of soil as surcharge acting at the footing's base elevation.  That assumes there is no shearing resistance within the top 2 m, so it's probably a tad conservative.  Besides, bearing capacity rarely governs allowable anyway - it's usually settlement.

RE: Foundation depth

Typically, from recollection - "deep foundations" start at a depth/width ratio of about 5.

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