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

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

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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.