#### MDC - Retaining walls (15)

The program calculates two thrusts: one in which it considers the upstream face of the wall as the thrust plane, in this case it always considers the ground-wall friction angle. The other, used for global verifies, which has as its thrust plan the ideal one that passes through the upstream extrados of the foundation; in the latter case, the program considers the ground-wall friction angle only if the “always use the wall-ground friction angle” option is checked from the Stratigraphy window.

Yes, to enter the short-term parameters you need to access the stratigraphy window, set the shear resistance angle equal to zero, report the undrained cohesion on the cohesion column, report on the saturated weight on the P.U.V. column.

Check the value of cohesion, in the calculation of horizontal pressures the software takes into account the cohesive contribution:
sh (z) = sv (z) Ka-2cKa ^ 0.5
sh (z) = horizontal pressure
sv (z) = vertical pressure
Ka = active thrust coefficient
c = cohesion

In addition to the verification of resistance, the program checks the minimum standards normative.

Yes, the program verify on the opening of the slits and on the tensions. It is necessary to create the SLE combination, to create it access the calculation window, position the mouse cursor on the text “Load combination”, from the drop-down menu that appears by clicking on the right button choose the New SLE option.

In the case of a uniformly distributed load, the increase in the horizontal pressure acting on the retaining wall is constant with the depth, the intensity does not vary by varying its position. The horizontal pressure generated by a stripe type overload, on the other hand, varies with depth and position, relative to the coping of the retaining wall. The theoretical method makes use of the theory of elasticity, the applied equation is that developed by Boussinesq.

No, in MDC the foundation material cannot be differentiated.

No, in MDC concentrated loads are assigned only on the section of the wall.

Yes, just assign a value less than zero to the height of the embankment (data menu / Terrain depth).

No, the downstream filling does not contributes with the passive thrust but increases the
interlocking of the foundation.

Yes, it is possible to modulate it from the stratigraphy window, varying the percentage of participation in the passive thrust.

For a cellar retaining wall or a wall founded on poles the verification of overturning and sliding is omitted.

No, the armor supplied as result from the program is that referred to the meter of longitudinal retaining wall development.

To all seismic combinations, defined by the user of EQU type, the program applies the beta increase of 50%.

Each combination can be defined as: STR, GEO, EQU.
If the combination has been defined as an EQU type, the program only performs the overturning verify.