USCS Soil Groups — Compacted Fill
| Group | Description | Coarse / Fine | Friction angle (°) | Unit weight (pcf) | Unit weight (kN/m³) |
|---|
Effective friction angle φ′ from NAVFAC DM-7.02 [2] (“>” marks the table’s lower bound); unit weight γ from AASHTO [3] in pcf, converted exactly to kN/m³.
Presumptive Allowable Bearing Pressure
| Class of material | Allowable (psf) | Allowable (kPa) |
|---|
IBC Table 1806.2 [1] vertical foundation pressure in psf, converted exactly to kPa. Mud, organic silt, organic clays, peat and unprepared fill have no presumptive value.
Mass Concrete on Soil — Friction Factor
| Foundation material | Friction factor | Friction angle (°), calculated |
|---|
Ultimate friction factor tan δ from NAVFAC DM-7.02 [2]; the friction angle δ = atan(tan δ) is calculated.
Driven Pile Design Parameters — Cohesionless Soil
| Soil | Shaft friction factor | Limiting shaft friction (kPa) | End-bearing factor | Limiting end bearing (MPa) |
|---|
API RP 2A-WSD Table 6.4.3-1 [4] (β, flim, Nq, qlim), for open-ended pipe piles driven unplugged. The table gives no values for very loose to loose sand, loose sand-silt or medium dense to dense silt.
Use these in the Soil Bearing Capacity, Footing Size, Lateral Earth Pressure, Retaining Wall Design, Infinite Slope Stability and Single Pile Axial Capacity calculators.