Washington State Department of Ecology
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buttresses
buttress structure
Some landslides can be stabilized with a buttress. However, buttressing may not always be effective or appropriate.

Stabilizing the toe
Some larger landslides can be stabilized by constructing an earth or rock buttress on the toe of the slide, effectively counterbalancing potential slope movement.

Does not prevent some slides
Buttressing will not prevent shallow slides and debris avalanches on steep slopes. On massive, deep-seated landslides, the scale and cost of effective buttressing is usually prohibitive.

Lack of space may limit use
One factor limiting the application of buttresses is the availability of sufficient space at the toe of the slide. When property ownership is an issue, where there are existing structures or a public right of way at the base, or along a shoreline where this technique would bury the beach and destroy critical habitat, buttressing may not be practical, nor legal.
 
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