Building Construction
Rotary drilling

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

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Building Construction
Negative skin friction

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

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Building Construction
Depth or height of the arch is the

Vertical distance between springing line and intrados
Perpendicular distance between springing line and extrados
None of these
Perpendicular distance between intrados and extrados

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