Discussion
Rotary core drilling is preferred to percussion boring in rock because it
Answer: B
Correct answer: recovers an intact core for examination
Percussion boring destroys the structure and returns disturbed chippings, from which nothing can be said about jointing or weathering. Rotary coring brings up a cylinder in which the discontinuities, their spacing, orientation and infilling are all visible and can be logged, and from which specimens for testing may be cut.
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