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Retention tank uplift (buoyancy) 1

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Eng.nmarko

Structural
Jul 29, 2019
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Hi guys,

I'm having a storm water retention tank which is 4.85 m deep in the ground, it is in a flood area, therefore ground water is considered full depth of the tank, base is about 51x21 m.
It is open, no top slab, as a pool. Bottom slab is 0.6 m deep, walls are 0.3 m. My question is if I use a bottom slab overhangs, is it correct to activate ground as a wedge and use the wedge weight against the uplift force. Also what is the cohesion force for saturated soil, I would use it as a friction force for stabilizing force as well. See attached picture for the reference.

2023-10-17_13_53_01-GstarCAD_2022_Professional_-_Drawing1.dwg_khmif6.png


Many thanks,

Marko
 
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