Discussion
Three of the following justify an exploratory adit. The exception is
Answer: A
Correct answer: the site is covered by deep uniform soft clay
An adit is driven to examine a rock mass in place, so it has no application in deep soft clay, where boreholes and sampling give everything an adit could and the excavation would need support throughout. The other three are the standard justifications: seeing the discontinuities, testing at the level of the works, and the scale of a cavern or dam abutment.
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