May 8, 2012

How RISAFoundation Determines the Soil Pressure Coefficient Calculation for Retaining Walls

RISAFoundation now has the ability to model and design retaining walls (see How to Model a Retaining Wall in RISAFoundation for more information). The program will take the input soil parameters and calculate the soil pressures considering Rankine theory. The program will also differentiate the calculations between a cantilevered and a propped retaining wall.

The Retaining Wall Definitions spreadsheet on the Soil tab is where these properties are defined.

There are inputs for the Heel, Saturated Heel, and Toe. If there is no water table then the Saturated Heel properties can be ignored. These can also be defined from the Retaining Wall Definition Editor.

Note that if you do not input the K values, then the program will use the coefficient of internal friction (φ) and the backfill angle (θ) to calculate K. For a propped wall, only the at rest K is used.

For a cantilevered wall, the active pressure equation will be used on the heel side and the passive pressure equation will be used on the toe side.

The detail report for the wall will give the resulting pressure calculations.

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