Navigation:  ENERCALC SEL > Calculation Modules > Retaining Walls > Cantilevered Retaining Wall > Effects of Sloping Backfill

How does the program alter the magnitude of the applied active pressure to account for the sloping backfill?

 

EFP: The program does not alter the magnitude of the applied active pressure to account for the sloping backfill.

 

Rankine: The Rankine equation includes the effects of backfill slope when calculating the active pressure.

 

Coulomb: The Coulomb equation includes the effects of backfill slope when calculating the active pressure.

 

 

What backfill height is used when sloping backfill is specified?

 

EFP: The program uses the height of soil that occurs at the end of the heel.

 

Rankine: The program uses the height of soil that occurs at the end of the heel.

 

Coulomb: The program uses the height of soil that occurs at the end of the heel.

 

 

At what angle does the active force act when sloping backfill is specified?

 

EFP: Vertical component is only calculated when the soil slope is non-zero.  To calculate the vertical component, the program uses the Rankine equation to back-calculate the angle of internal friction using soil slope, soil density and the user-entered equivalent fluid pressure (Ka).  From that angle it calculates the vertical component as tan(angle) * Ka.

 

Rankine: The active force acts at the angle specified for the sloping backfill.

 

Coulomb: The active force acts at phi/2 measured from the soil-surface of the wall.

 

 

If there is a vertical component of active force, how is the program treating that component?

 

EFP: The vertical component is applied at the back of the heel when user selects to include it.

 

Rankine: The vertical component is applied at the back of the heel when user selects to include it.

 

Coulomb: The vertical component is applied at the back of the heel when user selects to include it.

 

 

Is there anything that the user should be doing manually to adjust the input to account for the sloping backfill?

 

EFP: The user must adjust the magnitude of the EFP.

 

Rankine: No additional action is required on the part of the user.

 

Coulomb: No additional action is required on the part of the user.