Soil Pressure Acting On The Concrete Retaining Wall

Hence pa 1 1 2 ɣk a h 2 eq.

Soil pressure acting on the concrete retaining wall.

Sliding soil wedge theory is the basis for most of the theories by which lateral earth pressure is computed. In the analysis of retaining walls subjected to earth pressure it is very common to observe trapezoidal load distribution on the walls. 3 coulomb s active earth pressure. Normally earth pressure on a retaining wall is assumed to adopt a triangular load distribution but due to surcharge which is usually assumed to act on the ground surface the top of the wall experiences some degree of lateral 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. 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. F a 0 5 k γ h s 2 1a where. The main purpose of retaining wall construction is to retain soil.

If concrete has a specific weight gamma per foot length determine the magnitudes of the soil distribution w1 and w2 and the frictional force f for equilibrium. The inertial force is assumed to act at their respective center of gravity. 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. The resultant force due to the earth pressure acting on a basement wall can be calculated as.

W 200 lb ft a 2ft b 12ft c 6ft gamma 150 lb ft2. Separated into two components the static active soil pressure in a triangular shape and the. That is why soil lateral earth pressure is a major concern in the design. 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.

One large concrete block or multi layer blocks lock block. The amount of outward displacement of the wall necessary is about 0 001h to 0 004h for granular soil backfills and about 0 01h to 0 04h for cohesive backfills. However the active earth pressure condition will be reached only if the wall is allowed to yield sufficiently. Load combinations for concrete retaining walls supporting sound walls or containing.

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. Soil pressure acting on the concrete retaining wall is represented as a loading w per foot length of wall. Retaining walls are used for supporting soil laterally so that it can be retained at different levels on the two sides.