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Retaining Walls


A retaining wall is a structure that holds back soil or rock from a building, structure or area. Retaining walls prevent downslope movement or erosion and provide support for vertical or near-vertical grade changes. Cofferdams and bulkheads, structures that hold back water, are sometimes also considered retaining walls.



Retaining walls are generally made of masonry, stone, brick, concrete, vinyl, steel, or timber. Once popular as an inexpensive retaining material, railroad ties have fallen out of favor due to environmental concerns. Retaining walls are often used as a barrier on a beach. They stop the earth from eroding and collapsing.

The most important consideration in proper design and installation of retaining walls is that the retained material is attempting to move forward and down slope due to gravity. This creates a lateral earth pressure behind the wall which depends on the angle of internal friction (phi) and the cohesive strength (c) of the retained material, as well as, the direction and magnitude of movement and retaining structure undergoes. Lateral earth pressures are typically smallest at the top of the wall and increase toward the bottom.

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