Why is there a discrepancy in shear wave velocity – cone tip resistance (Vs–qc) correlations’ trends with respect to grain size?

Why is there a discrepancy in shear wave velocity – cone tip resistance (Vs–qc) correlations’ trends with respect to grain size?

Research Abstract
NULL
Research Authors
Karray, Mourad; Hussien, Mahmoud N.
Research Department
Civil Engineering Department
Research Journal
Canadian Geotechnical Journal
Research Member
Mahmoud Nasser Hussien Ahmed
Research Pages
p 1041-1047
Research Publisher
NULL
Research Rank
1
Research Vol
v 55, n 7
Research Website
NULL
Research Year
2018