Hello, since the undrained shear resistance (tf/m2) is 0 (zero) in a cohesionless soil, the normal force formed in the piles is multiple and multiple of the safe resistance. In cohesionless soils, the internal friction angle is given in the soil survey. Since I am solving piles for the first time, what should I write in the part with shear strength without drainage in the soil layers part, on cohesionless soils. or pile calculation is made only on clayey (cohesive) soils in the idecad static program. Thank you in advance for your help.