Elasticity of Soil
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Young's modulus for soil in the layer containing the tip (bearing) (Es), in the selected units.
Note: The default value of 0.3 ksi may be high for some loose sands or soft clays, but is generally conservative for most soils used for drilled pier tips.
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Number of Layers
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Specify the number of soil layers to be added to the table.
Note: If the water table is located within a soil layer, soil layer should be split into two parts.
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Generate Table
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Click to generate a table with a number of rows corresponding to the No. of Layers specified.
CAUTION: If data has already been added to the table, clicking this button again will delete the current data and rebuild the table.
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Depth / Cohesion / Density Unit |
Units used for Soil Layer Depth, Soil Cohesion (undrained shear strength) and Soil Density in the Soil Profile table cells. All cells in a column must be entered in the same type of units.
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Soil Profile Table |
Column |
Description |
Soil Type |
Select the soil type that best describes the layer
- (API Method) Select from Clay, Silt, Sand, Gravel, Sand-Silt and Others
- (FHWA Method) Select from Clay and Sand. Clay is selected in case of cohesive soil and either of Silt, Sand, Gravel, Sand-Silt is chosen for Cohesionless soil.
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Density Type |
(API method) Select soil density from Very Loose, Loose, Medium, Dense, Very Dense.
Selection is used to determine Nq values from Table 6.4.3-1— "Design Parameters for Cohesionless Siliceous Soil"
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Depth |
Depth for each soil layer is measured from Ground Elevation (GE, by default 0ft) to top of the respective soil layer. |
Friction Angle |
Effective Friction Angle (Soil-Pile Friction Angle) for cohesionless soil layer, in degrees. It is assumed that the soil’s Angle of Internal Friction equal to the Effective Friction Angle. |
Cohesion |
Undrained shear strength of a cohesive soil. |
Avg. Density |
Average soil density for the respective soil layer.
Note: If the water table is located within a soil layer, soil layer should be split into two parts with different soil densities.
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N60 |
(FHWA Method) Input for design value for SPT (Standard Penetration Test) blow count, taken as average value within the soil layer. Unit for N60 is B/ft (Blows/ft). |
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Exits the Wizard without creating a new Drilled Pier Job.
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