As mentioned in the previous section, in order for the active wedge (Fig. 11.3) to be developed, there
must be sufficient movement of the retaining wall (Table 11.1). There are many cases where movement
of the retaining wall is restricted. Examples include massive bridge abutments, rigid basement
walls, and retaining walls that are anchored in non-yielding rock. These cases are often described as
restrained retaining walls.