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Discussion

A high rock quality designation indicates a rock mass that is

  • A.of high intact strength but unknown jointing
  • B.widely jointed and largely intact
  • C.closely jointed and broken
  • D.chemically weathered throughout

Answer: B

It measures the spacing and continuity of the discontinuities rather than the strength of the intact material between them. A strong rock cut by close joints scores badly and behaves badly, which is the point of the index.

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