geost.analysis.interpret_cpt.calc_ic#

geost.analysis.interpret_cpt.calc_ic(qc, rf) → ndarray[source]#

Calculate non-normalized IC values (I_SBT in Robertson 2010). The non-normalized variant does not require calculations of stresses to normalize with and hence no PWP data is required.

Please note the following when using non-normalized IC values:

“The non-normalized SBT index (ISBT) is essentially the same as the normalized SBTn index (Ic) but only uses the basic CPT measurements. In general, the normalized Ic provides more reliable identification of SBT than the non-normalized ISBT, but when the insitu vertical effective stress is between 50 kPa to 150 kPa there is often little difference between normalized and non-normalized SBT.”

Parameters:

  • qc (np.ndarray) – Cone resistance values

  • rf (np.ndarray) – Friction number

Returns:

Non-normalized IC

Return type:

np.ndarray