Foundation´s slab over soil subject to torsion in plant.

[Tito54]

Dear All.

I have a circular background slab of a thickener directly supported on the floor. How can I verify the capacity of the soil to withstand the torsion in the plant reaction due to the action of the cicular movement of the equipment that maintains the sludge without deposition (it is a huge torque). I could not find anything in the Terzhagi or Bowles formulas.

best regards

Tito54

 

[KootK]

I would think that you'd have to estimate an allowable soil friction value and then treat it like shear stress in a circular shaft. Depending on what you've got going on in plan, you might be able to engage some adjacent slab and foundations as well.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[SlideRuleEra]

If this is conventional bridge thickener there should not be any torsion on the soil.
The tank wall supports the drive motor.
As the rake plows though the slurry the torque required is balanced by an exactly equal, but opposite torque exerted by tank wall to keep the motor stationary.

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[Tito54]

Thanks so much.


Best regards

Tito54