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Relationship between N value and phi in deep foundation

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Reston

Geotechnical
Jan 31, 2007
4
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
 
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I forgot to mention that I need N-Phi relationship in silty clayey or clayey soils. Is there anyone who could help me?

Reston
 
Reston,

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

Jeff
 
Reston,

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

Jeff
 
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
 
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.
 
Thank you very much all for great help

Reston
 
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