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Use of Vertical Component

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Use of vertical component of active lateral soil pressure

 

This category offers the following three options for considering the vertical component of active lateral soil pressure:

 

Use for Soil Pressure

Use for Sliding Resistance

Use for Overturning Resistance

 

When used, the vertical component of the lateral pressure is applied at a vertical plane at the back of the footing as follows:

 

When EFP is used, the program will backsolve the Coulomb equation to find the equivalent internal friction angle, phi.  When the Coulomb method is used, the phi angle is specified by the user.

 

In configurations where there is no heel projection beyond the soil face of the stem, the failure plane is assumed to be at the soil-wall interface, so the program uses phi/2 for the soil-wall friction angle.

 

In configurations where there is a heel projection beyond the soil face of the stem, the failure plane is assumed to be at the end of the heel, which will be a vertical plane up through the soil.  This will be a soil-on-soil interface, so the program uses phi as the friction angle to determine the vertical component.

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