Building Construction
Negative skin friction

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

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Building Construction
In the method of tube boring of soil investigation, the following is essential:

A tube of about 2 meters length and 20 cm diameter with a cutting edge
A flap valve at the bottom of tube is provided to extract the soil sample
All listed here
The tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand

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