Building Construction
Rotary drilling

Is not economical for holes of less than 10 cm
Is not suitable for deposits containing very coarse gravel
All listed here
Hinders the ground water observations and permeability test

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Building Construction
Negative skin friction

Neither (A) not (B)
Both (A) and (B)
Develops due to lowering of ground water
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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