Lateral Earth Pressure Tab |
  
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Lateral Earth Pressure Tab |
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| Lateral Earth Pressure Method: | This is a conditional input. It is only available when tie-backs are not used. When it is available, it allows the use of Rankine Active Pressure or Equivalent Fluid Pressure methods. When tie-backs are used, the pressure is applied as described on the Soil Pressure Reference tab. |
| EFP: | Equivalent Fluid Pressure of the retained material, usually obtained from the geotechnical engineer. |
| Soil Phi, degrees: | Angle of internal friction of the retained material, usually obtained from the geotechnical engineer. |
| Soil Density, pcf: | Density of the retained soil, usually 100 to 130 pcf. |
| Surcharge top of soil at retained side, psf: | Surcharge on upper grade such as for equipment, materials, or contingencies. |
| Backfill Slope, degrees: | Slope of the backfill measured in degrees from horizontal. |
| Passive Pressure, psf/ft: | Passive pressure in pcf. When using Rankine active soil pressure method, passive pressure is calculated as (1/Ka)*(soil density). When using EFP, the passive pressure is a user input. |
| Apply S.F. to Passive Pressure: | Safety factor that will be applied to the above passive pressure, typically suggested by the geotechnical engineer. |
| Neglect this height of Passive Pressure @ Top: | Allows a specified height of passive pressure to be ignored for resistance, such as if the soil was likely to be frost disturbed or otherwise unsuitable to resist lateral pressure. Note that this input is specified in units of inches. |
| Multiplier on Ka*Gamma*H: | This is a conditional input. It is only available when tie-backs are used, and it allows the user to fine tune the pressure value. The Soil Pressure Reference tab shows how the soil pressure distribution is developed. |
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