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Underground tank Stability against Buoyancy

Underground tank Stability against Buoyancy

Underground tank Stability against Buoyancy

(OP)
dear specialist

i`m going to design an underground water tank using soil above toe in addition to the tank dead weight , the GWT level at the grade level ,
the question is :

could i use a cement sand soil instead of clay soil ?
what is the soil submerged weight ?
what is the inclination angle to be considered ?? 40 , or less ??

RE: Underground tank Stability against Buoyancy

In order to be conservative, some factor of safety maybe is better than none, by using smaller end of unit weight and friction values.

So In answer: Yes: 60 #/cf : 20 degrees. This allows for possible construction work not being the best.

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