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This is an example of a retaining wall failure
a familiar hazard in ground engineering,
an engineer designed the wall to hold the dry sandy soil while houses have been
built above
examples of this can be seen when roads or railways or
other excavations have been built that
cut into the land.
Unfortunately this wall has not been designed correctly and started to fail.
This slope failure is translational in nature and you can see the slip plains
that have formed.
slope failures in wet clays and silts tend to fail at shallower angles and be of
a rotational or flow type failure.