Statements (23)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:rock_mass_classification_system
|
| gptkbp:appliesTo |
mining
tunneling rock engineering |
| gptkbp:citation |
Barton, N., Lien, R., and Lunde, J. (1974). Engineering classification of rock masses for the design of tunnel support. Rock Mechanics, 6(4), 189-236.
|
| gptkbp:component |
Ja (Joint alteration number)
Jn (Joint set number) Jr (Joint roughness number) Jw (Joint water reduction factor) RQD (Rock Quality Designation) SRF (Stress reduction factor) |
| gptkbp:developedBy |
NGI (Norwegian Geotechnical Institute)
|
| gptkbp:introducedIn |
1974
|
| gptkbp:parameter |
Q value
|
| gptkbp:Q_value_formula |
Q = (RQD/Jn) × (Jr/Ja) × (Jw/SRF)
|
| gptkbp:relatedTo |
RMR system
rock mass rating |
| gptkbp:usedFor |
gptkb:tunnel_design
rock mass classification underground excavation stability assessment |
| gptkbp:bfsParent |
gptkb:GAL4/UAS_system
|
| gptkbp:bfsLayer |
6
|
| https://www.w3.org/2000/01/rdf-schema#label |
Q system
|