Soil Pressure Acting Concrete Retaining Wall

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Soil pressure acting concrete retaining wall.

It can be constructed from different materials such as concrete stone and masonry units. Dynamic soil pressure in a rectangular shape as shown in figure 3. On the other hand if the wall moves into the soil then the soil mass is compressed which also mobilizes its shear strength and the passive pressure develops. A retaining wall is a structure designed and constructed to resist the lateral pressure of soil when there is a desired change in ground elevation that exceeds the angle of repose of the soil.

Typical retaining walls a gravity type stone retaining wall a gravity wall relies solely on its mass and geometry to resist the soil pressure forces acting on it. Sliding soil wedge theory is the basis for most of the theories by which lateral earth pressure is computed. Static soil pressure total soil pressure 1 3. Notice that the pressures acting on the wall are equivalent to the area triangle of the pressure distribution diagram.

F a resultant force acting on the basement wall kn h s height of backfill soil m γ specific weight of backfill soil kn m 3 k coefficient of earth pressure at rest. The main purpose of retaining wall construction is to retain soil. The resultant force due to the earth pressure acting on a basement wall can be calculated as. That is why soil lateral earth pressure is a major concern in the design.

F a 0 5 k γ h s 2 1a where. Soil pressure acting on the concrete retaining wall is represented as a loading w per foot length of wall. Sliding overturning and bearing forces shall be taken into consideration while this type of retaining wall structure is designed. 1 where h is the height of retained soil.

Commonly gravity retaining wall is massive because it requires significant gravity load to counter act soil pressure. The active pressure develops when the wall is free to move outward such as a typical retaining wall and the soil mass stretches sufficiently to mobilize its shear strength. One large concrete block or multi layer blocks lock block. The hydrostatic pressure and the soil load act on the wall concurrently.

Lateral earth pressure acting on retaining wall. Hence pa 1 1 2 ɣk a h 2 eq. Retaining walls are used for supporting soil laterally so that it can be retained at different levels on the two sides. However as you noted the soil load is reduced because the effective weight of the soil is reduced due to buoyant forces.