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Basement subjected to uplift

Basement subjected to uplift

Basement subjected to uplift

(OP)
During the design of basement, why do we need to consider the uplift of the basement subjected to hydraulic uplift ?

When the excavation happen, watertable drawdown occur at the exacavted part.

When the excavation finished, the watertable already at the base, why the basement will be subjected to uplift ?


Can someone help to explain on this ?

RE: Basement subjected to uplift


The following is excerpt from ( Groundwater Lowering in Construction , by P. M. Cashman and M. Preene )

The groundwater lowered during foundation construction.Then the pumping is stopped and the GWL raises to original level and uplift pressure builts up .













If you put garbage in a computer nothing comes out but garbage. But this garbage, having passed through a very expensive machine, is somehow ennobled and none dare criticize it. ( ANONYMOUS )

RE: Basement subjected to uplift

If the water table was high enough to require drawdown during excavation, why wouldn't the water table return to original elevation when the work is complete? Is there a post construction dewatering system?

RE: Basement subjected to uplift

Quote (TerryScan

.... Is there a post construction dewatering system?)


Even if dewatering continues after construction, still the finished structure shall be safe against uplift / floating.. ( GWL may raise to original level due to some risks, power or pump failure ..)







If you put garbage in a computer nothing comes out but garbage. But this garbage, having passed through a very expensive machine, is somehow ennobled and none dare criticize it. ( ANONYMOUS )

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