Lateral Earth Support Structures
A retaining wall is a structure that holds back earth. Retaining walls stabilize soil and rock from downslope movement or erosion and provide support for vertical or near-vertical grade changes. Cofferdams and bulkheads, structures to hold back water, are sometimes also considered retaining walls.
The primary geotechnical concern in design and installation of retaining walls is that the retained material is attempting to move forward and downslope due to gravity. This creates soil pressure behind the wall, which can be analysed based on the angle of internal friction (φ) and the cohesive strength (c) of the material and the amount of allowable movement of the wall. This pressure is smallest at the top and increases toward the bottom in a manner similar to hydraulic pressure, and tends to push the wall forward and overturn it. Groundwater behind the wall that is not dissipated by a drainage system causes an additional horizontal hydraulic pressure on the wall.
Read more about this topic: Geotechnical Engineering
Famous quotes containing the words earth, support and/or structures:
“Alas, so all things now do hold their peace:
Heaven and earth disturbed in no thing:
The beasts, the air, the birds their song do cease;
The nightes chare the stars about doth bring.”
—Henry Howard, Earl Of Surrey (1517?–1547)
“The confirmation of Clarence Thomas, one of the most conservative voices to be added to the [Supreme] Court in recent memory, carries a sobering message for the African- American community.... As he begins to make his mark upon the lives of African Americans, we must acknowledge that his successful nomination is due in no small measure to the support he received from black Americans.”
—Kimberly Crenshaw (b. 1959)
“The philosopher believes that the value of his philosophy lies in its totality, in its structure: posterity discovers it in the stones with which he built and with which other structures are subsequently built that are frequently better—and so, in the fact that that structure can be demolished and yet still possess value as material.”
—Friedrich Nietzsche (1844–1900)