Geogrid

Wall Geometry Tab

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Retained Height:

Enter the retained height, which is assumed to be the total wall height above the setting base. It should be an even multiple of the height of the selected block.

Embedment:

Depth below grade (on the low side) to top of setting pad. Usually one block course or 1’-0”.

Base Pad Depth:

Thickness of the base pad.

Backfill Slope:

Select the backfill slope from the drop-down list box.

Soil Density, Exterior (in-situ):

Enter the density of the native soil beyond the backfill zone and under the base.

Soil Density, Interior (backfill):

Enter the density of the backfill material (typically granular soil or gravel).

Soil Phi, exterior (friction angle, Φie):

Enter the angle of internal friction of in-situ soil.

Wall/Soil Friction Angle, δ:

The friction angle at the soil/wall interface is calculated by the program as 2/3 Φe and reported here.

Soil Phi, interior (friction angle, Φi):

Enter the angle of internal friction of the backfill soil.

Ka (Horiz):

Coulomb's coefficient of lateral active earth pressure.

Base width, ft (only applies to segmental walls with geogrids): Enter the full base width including wall depth. (usually 60% - 70% of retained height).

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Allowable Soil Bearing Pressure:

Enter the allowable soil bearing pressure or click the button labeled "Use Terzaghi Value"