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R-20 — Clay Low Plasticity

Soil Category
Clay Low Plasticity
Phi Deg
20
K0 (dimensionless)
0.658
Ka (dimensionless)
0.4903
Kp (dimensionless)
2.0396
Cohesion kPa (kPa)
20
Cohesion Note
Cohesion Psf Is Non-Monotonic vs Phi for Clay Low Plasticity Because the Source Rows Compile Multiple specimens; Cohesion Peaks at PHI=24 in the Das/Bowles compilation. Use Specimen Id to disambiguate.
Cohesion Psf (psf)
418
Delta Wall Friction Deg (deg)
13
Description
Lean Clay (CL), USCS, Drained
Gamma kN M3 (kN/m3)
18
Gamma Pcf (pcf)
115
Specimen Id
CL-Nc-Soft
clay_low_plasticity — phi deg 20 · specimen id CL-NC-soft · K0 0.658 dimensionless · Ka 0.4903 dimensionless · Kp 2.0396 dimensionless | Earth Pressure Coefficients | Engineering Database