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Basement subjected to uplift

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dccd

dccd

Civil/Environmental
Joined
Feb 19, 2021
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150
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SG
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 ?
 
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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 .


GWL_LOWERING_u0fz0j.jpg













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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?
 
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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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