GGU-SIEVE: Suffosion safety by separating a grading curve

For verification of suffosion safety in accordance with the Merkblatt Anwendung von Kornfiltern an Bundeswasserstraßen (MAK) (Fact Sheet for the Application of Grain Filters on Waterways), published by the Bundesanstalt für Wasserbau (BAW) in Karlsruhe (2013), it is necessary to divide the grading curves into 2 new curves at a given grain diameter.

In this menu item's dialog box, select the grading curve to be divided and specify the passage or grain size at which it is to be separated.

The program now displays a message box with the grain diameter or the %. passage If you adopt the values, the selected grading curve is separated. A further message box is then displayed with information on the passages of the new grain size distribution. This can be copied directly into the clipboard. After closing the box, the two new grain size distributions are displayed in the graphics.

The suffosion safety of these soils can then be examined via an analysis of the filter stability after Cistin/Ziems.