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Piles
NAVFAC: 1.0 - 1.5 for a single displacement pile in compression
USACE: 1.0 - 2.0 for compression piles in sand that are not pre-bored, jetted or vibrated
1.0 for same conditions except silt
higher values are for displacement piles
Broms: 0.5 - 1.0 for low density to high density steel
1.0 - 2.0 low density to high density
concrete
1.5 - 4.0 low density to high density
timber
Bowles: 0.6 - 1.25. Lower values for silty sands, and higher values for other soils
Nordlund: uses charts to identify the value for lateral earth pressure coefficients, k,
based on the angle of internal friction, f. Ranges from 0.25 to 1.2
Mansure & Hunter: 1.0 - 1.3 for steel pipe piles
1.4 - 1.9 for H piles
1.45 - 1.6 for precast concrete piles
Retaining Walls
K = (1 - sinf)/(1 + sinf) for active earth pressures
K = (1 + sinf)/(1 - sinf) for passive earth pressures
K = 1 - sinf for at-rest earth pressures
where f = angle of internal friction of the soil (degrees)
Other soil and soil related properties are listed below:
Angle of Internal Friction
Bearing Capacity Factors
Cohesion
External Friction Angle
Factor of Safety
Lateral Earth Pressure Coefficients
Modulus of Vertical Subgrade Reaction
Soil Unit Weights
Young's Modulus or modulus of elasticity
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