GGU-TRENCH: Safety against slippage of single grains or grain groups

The safety against slippage of single grains or grain groups eta(i) (also known as inner stability) is calculated pursuant to old DIN 4126 (Section 9.1.2) from

The program simplifies '' by adopting the buoyant (effective) unit weight of the soil.

The old DIN 4126 (9.1.2) and DIN 4126:2013 (6.2) require a safety factor of 1.0.