Building Construction
Raft foundations are used for:

Spanning over small soft or loose pockets
Counter acting the hydrostatic effect
Providing increased area of foundation over poor bearing capacity of soil
All listed here

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Building Construction
Negative skin friction

Is a downward drag acting on a pile due to downward movement of the surrounding compressible soil relative to the pile
Develops due to lowering of ground water
Both (A) and (B)
Neither (A) not (B)

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