ONENGINEER
Geotechnical
- Oct 13, 2011
- 284
Hi - I am analyzing boreholes with 200-250 ft depths in predominantly silt, clayey silt or sandy silt. No Shelby but only SPT. Correlations are often through N-values, which I assume is the raw SPT obtained in the field. For example
Beta= (N//15)* (1.2 - 0.11 sqrt(Z). or Phi= 0.3N + 27 or some other soil parameter-N value plots.
Were these correlations meant for the raw SPT data or one should use his own initiative by obtaining N1(60) or N(60) and then use the above correlation formulations. In the latter case one wonders if the constants in the correlations remain the same if N, N1(60) or N(60) are used. Hope I could explain my question clearly and I would appreciate your feedback. Thank you.
Beta= (N//15)* (1.2 - 0.11 sqrt(Z). or Phi= 0.3N + 27 or some other soil parameter-N value plots.
Were these correlations meant for the raw SPT data or one should use his own initiative by obtaining N1(60) or N(60) and then use the above correlation formulations. In the latter case one wonders if the constants in the correlations remain the same if N, N1(60) or N(60) are used. Hope I could explain my question clearly and I would appreciate your feedback. Thank you.
