In terms of the internal stability of MSE walls, Zornberg et al. (1998) have shown that there is very good agreement between the actual location of the slip surface and the location of the critical slip surface predicted by slope stability analyses (i.e., method of slices). To check the stability of the mechanically stabilized zone, a slope stability analysis can be performed where the soil reinforcement is modeled as horizontal forces equivalent to the allowable tensile resistance of the geogrid. In addition to calculating the factor of safety, the pullout resistance of the reinforcement along the slip surface should also be checked.
The analysis of mechanically stabilized earth retaining walls is based on active earth pressures.
It is assumed that the wall will move enough to develop the active wedge. Similar to concrete retaining walls, it is important that building footings or other load carrying members are not supported by the mechanically stabilized earth retaining wall and the active wedge, or else they will be subjected to lateral movement.
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