Machine-translated by Google. Questions are authored in English.
Top

Discussion

Rock quality designation contributes to a tunnel classification by measuring

  • A.the volume of water the rock mass will yield
  • B.the degree of jointing of the rock mass
  • C.the compressive strength of the intact rock material
  • D.the stress acting in the ground before excavation

Answer: B

Correct answer: the degree of jointing of the rock mass

Rock quality designation is computed from a core run as the percentage made up of intact pieces longer than 100 mm, so it measures how closely the mass is broken by discontinuities rather than how strong the rock itself is. That is why it appears in classification systems alongside a separate term for intact strength.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.