Retaining walls are built in order to hold back earth which would otherwise move downwards. Their purpose
is to stabilize slopes and provide useful areas at different elevations. Every retaining wall supports a “wedge”
of soil. The wedge is defined as the soil which extends beyond the failure plane of the soil type present at the
wall site, and can be calculated once the soil friction angle is known. As the setback of the wall increases, the
size of the sliding wedge is reduced. This reduction lowers the pressure on the retaining wall.
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