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ROCK
MASS
CLASSIFICATION
By ranavasiya jyoti
M.tech 1 year
ROCK QUALITY
DESIGNATION
➢ RQD is the sum of lenght (between natural
joints) of all core pieces more than 10cm long
as a percentage of the total core length.
➢
➢ Equation of RQD
➢
➢
➢
➢
➢
Table of RQD
S.NO RQD ROCK QULITY CLASSIFICATION
1 < 25 VERY POOR
2 25-50 POOR
3 50-75 FAIR
4 75-90 GOOD
5 90-100 EXCELLENT
➢ In the undergroud opening it is usually possible
➢ to gate a three dimensional view of rock mass
➢ a three dimensional RQD may therfore be used.
➢ The following formula may be used
➢
➢ RQD = 115 – 3.3 Jv
➢
➢ where jv is number of joints
EXAMPAL
THANK YOU

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Rock mass classification.odp

  • 2. ROCK QUALITY DESIGNATION ➢ RQD is the sum of lenght (between natural joints) of all core pieces more than 10cm long as a percentage of the total core length. ➢ ➢ Equation of RQD ➢ ➢ ➢ ➢ ➢
  • 3. Table of RQD S.NO RQD ROCK QULITY CLASSIFICATION 1 < 25 VERY POOR 2 25-50 POOR 3 50-75 FAIR 4 75-90 GOOD 5 90-100 EXCELLENT
  • 4. ➢ In the undergroud opening it is usually possible ➢ to gate a three dimensional view of rock mass ➢ a three dimensional RQD may therfore be used. ➢ The following formula may be used ➢ ➢ RQD = 115 – 3.3 Jv ➢ ➢ where jv is number of joints
  • 6.