# USACE CWALSHT Retaining Wall Design [PORTABLE] Full Version

The sheet pile wall is prevented from lateral displacement by the application of retaining soil pressure exerted by the soil mass above the wall. The permeability of the soil mass above the wall and the soil mass below the wall are input factors as specified in the CUR procedure, 2.5 and 3.3, respectively. In the case where vertical forces are considered, the pressure on each side of the wall exerts a vertical component component and a horizontal component onto the wall. The total effective pressure is equal to the sum of the vertical and horizontal components. The larger the soil mass above the wall, the more the vertical component exerts a downward force onto the wall. The effective pressure, P, and the water pressure, q, must also be within the limits of those specified in the CUR procedure. The soil mass above the wall is usually less massive than the soil mass below the wall. The exception is when the soil is free of slope and the soil above the wall is as massive as the soil below the wall. For the two cases mentioned in the preceding paragraph, the coefficients of all roofs, V, L, S, and VSF (see Figure 3.1), are also input for the sheet pile design and computation. The calculation is similar to the analysis of the roof with a coefficient to compute the water pressure in the presence of a sheet pile wall.

## USACE CWALSHT Retaining Wall Design full version

Enter the failure load of the sheet pile F as a Design factor of safety factor less than 1.0. If the soil available strength A, the distance a and the depth H, are specified, CWALSHT calculates the required bearing pressure P.B as follows: In order to incorporate rapid seepage volumes, a manufacturer's safety factor can be applied to the APx A value. Current US practice in bridge construction is to specify the allowable seepage pressure of the soil to be 1.0. When using a resistance approach, thickness of the berm is required to be at least 0.5 times the design seepage pressure. The finite element method can be used for modelling the seepage effects associated with sheet pile retaining walls. The finite element method is more rigorous than some of the other seepage analysis techniques described below.

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