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GGU-TRENCH: General notes

Four safety factors must be determined to verify the stability of a diaphragm wall:

  1. Safety against groundwater ingress
    (DIN 4126 (old); 9.1.1 or DIN 4126:2013; 6.1)

  2. Safety against slippage of single grains or grain groups
    (DIN 4126 (old); 9.1.2 or DIN 4126:2013; 6.2)

  3. Safety against the slurry level falling below the minimum level required for stability
    (DIN 4126 (old); 9.1.2 or DIN 4126:2013; 6.3)

  4. Safety against slip surfaces endangering the stability of the trench
    (DIN 4126 (old); 9.1.2 or DIN 4126:2013; 6.4)

The verifications for 1, 2 and 4 are performed by the program. A verification for 3 must be estimated pursuant to DIN 4126 (old), 9.1.3 or DIN 4126:2013; 6.3.

In comparison to the old safety factor concept, the new DIN 4126:2013 does not bring with it any substantial changes. The old standard requires the following verification for the stability of the trench (see Table 2 in old DIN 4126):

image-20241104-085526.png

The new standard requires the following verification:

image-20241104-085544.png

where image-20241104-085614.png H = 1.0 and image-20241104-085619.png E = 1.1 or 1.3 (see Table 4 in DIN 4126:2013).

Solved for image-20241104-085628.png E we get

image-20241104-085641.png

which corresponds to the relationship given in DIN 4126 (old).