Navigation:  Calculation Modules > Retaining Walls > All Retaining Walls > Results Tabs > Global Stability

This screen presents the driving force tending to cause a global stability (scooping) failure, the force tending to resist the failure, and the ratio.

 

 

The Global Stability check follows the procedure in Principles of Foundation Engineering, 2nd Edition, Das, where various circular failure planes are tested.  Each circle is broken into slices of soil behind the wall and in front of the wall.  The weight of the soil slices is used to calculate a total driving moment, tending to upset the stability.  And it is also used to determine tangential frictional forces on each slice, tending to restore stability.

 

This tab will not be displayed if a water table is specified, or if a pier foundation is specified.