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Relationship between N value and phi in deep foundation

Relationship between N value and phi in deep foundation

Relationship between N value and phi in deep foundation

(OP)
I am looking for if there exists any relationship between no of blows N and phi.As we have between N and Cohesion.

Thanks

Reston

RE: Relationship between N value and phi in deep foundation

(OP)
I forgot to mention that I need N-Phi relationship in silty clayey or clayey soils. Is there anyone who could help me?

Reston

RE: Relationship between N value and phi in deep foundation

Reston,

Suggest you use relations correlating phi for cohesive soils and PI presented as Figure 3-4 in USACE EM 1110-2-2504.

Jeff

RE: Relationship between N value and phi in deep foundation

Reston,

Suggest you convert your SPT N values to N60 values for use with Bowles' correlations per PSlem's reference.

Jeff

RE: Relationship between N value and phi in deep foundation

Reston,

Oops - just noticed that PSlem's reference shows correlation for non-cohesive soils, so it won't be direclty applicable to silty clay or clay soils.

Jeff

RE: Relationship between N value and phi in deep foundation

I would hesitate to use correlations between N value and phi in clayey soils with silt or sand....you need to do some lab testing.

RE: Relationship between N value and phi in deep foundation

(OP)
Thank you very much all for great help

Reston

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