Discussion
An exploratory adit is used in preference to boreholes where
Answer: A
Correct answer: the rock mass must be examined and tested in place
A borehole samples a line a few centimetres wide; an adit exposes the rock mass itself - its joints, shear zones and their infillings - and allows in situ tests at the level of the works. The cost is only justified where those questions govern the design, which in practice means large caverns, dam abutments and major tunnels.
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