MobiSlope allows an unlimited number of surcharges to be applied to the ground surface of the slope geometry.
To create a surcharge, tap Define Surcharge , select a line on the ground surface and drag your finger above the desired location.
You will be presented with two blue markers representing the left and right boundaries of the surcharge.
Tap markers for manual input of the location, or slide markers to move location above the selected line. Note that surcharge boundaries do not snap.
Use the Select/Pan tool to edit the surcharge pressure and inclination angle by pressing and holding your finger over the surcharge. A constant or linear change in surcharge pressure may be specified.
By default surcharges are created normal to the selected ground surface line. Surcharges can not be specified parallel to the ground surface line.
The units to define surcharges are kPa in Metric and psf in Imperial.
MobiSlope sums each surcharge pressure over the width of each slice it passes over and creates a force acting at the top mid point of the slice, at the specified inclination angle.
Once an analysis is complete, use the Inspector Tool and tap over a slice to view the slice forces and verify the surcharge pressure has been modeled as expected.
Take care specifying surcharges on a submerged ground surface. If the option "Include No Strength Regions in Slice" is enabled for submerged slopes, the surcharge will be applied to the top of a no strength region, which is not physically possible. In this case it is recommended to use the "Apply Hydrostatic Force to Top of Slice" option for submerged slopes.
Using the Select/Pan Tool to edit / delete a surcharge
Tap the Select/Pan Tool in the Drawing tab of the tool palette, and tap once on a surcharge in the drawing to select it. The surcharge will be highlighted to indicate it is selected. Now press and hold over the selected surcharge and a menu will be presented with the option to edit the surcharge magnitude/angle, or delete the surcharge.