Building Construction
While investigating the site, a thick layer of fairly firm clay over a deep layer of soft clay is encountered. In such a situation, the following type of foundation is useful:

None of these
Pile formation
Grillage foundation
Raft foundation

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Building Construction
Negative skin friction

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

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