Soil Pressure Acting On The Concrete Retaining Wall

W 200 lb ft a 2ft b 12ft c 6ft gamma 150 lb ft2.

Soil pressure acting on the concrete retaining wall.

One large concrete block or multi layer blocks lock block. Separated into two components the static active soil pressure in a triangular shape and the. Notice that the pressures acting on the wall are equivalent to the area triangle of the pressure distribution diagram. F a 0 5 k γ h s 2 1a where.

In the analysis of retaining walls subjected to earth pressure it is very common to observe trapezoidal load distribution on the walls. The main purpose of retaining wall construction is to retain soil. 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. 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.

However the active earth pressure condition will be reached only if the wall is allowed to yield sufficiently. 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. 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.

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. Soil pressure acting on the concrete retaining wall is represented as a loading w per foot length of wall. 1 where h is the height of retained 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.

Hence pa 1 1 2 ɣk a h 2 eq. 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 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. Retaining walls are used for supporting soil laterally so that it can be retained at different levels on the two sides.

3 coulomb s active earth pressure. Sliding soil wedge theory is the basis for most of the theories by which lateral earth pressure is computed. The inertial force is assumed to act at their respective center of gravity.