Slope Mass Rating (SKR) is a system of classification developed by ROMANO (1985) as an application of BIENIAWSKI (1979) Rock Mass Rating. In order to assess lope instability risks, parameters are introduced to cover attitude of discontinuities and slope, failure modes and slope excavation methods. According the SKR index results the slopes fit into different instability classes Support measures, appropriated for every range of SMR, are listed (nets, toe ditches, dental concrete, shotcrete, bolts, anchors, reexcavation …). The SMR classification has been checked against slopes with different stability degrees, which needed from local support to total reexcavation. Actually the SMR system it is a useful instrument for evalation of slope risks.


La clarification des Talus (SMR) est un systeme de classification develope par ROMANA (1985) comme application de la classification Geomechanique des Roches (RMR) de BIENIAWSKI (1979). Au but de constater les risques d" instabilite des talus, on a inroduit des parametres pour evaluer l"effet de lórientation des discontinuites, manieres d"echouement, et methodes d"instabilite. Les mesuures de correction convenables pour chaque classe SMR a ete essayee avec des talus à differentes degrees de stabilite ayant besoin de correction locale jusquúne reexcavation totale. A present, le systeme SMR est un instrument tres utile pour l"evaluation des risques des talus.


Slope Mass Rating (SMR) ist ein Klassenordnungssystem, das Romana entwickelt hat (1985), als Verwendung des Bienawkis (1979) Rock Mass Rating. Um das Unbestandigkeitsrisiko der Böschungen zu analysieren, beobachtet man die Parameter, die folgende Begriffe messen: Die Orientierung der Kluftflachen und der Böschungen, die Bergrutscharten und die und die Böschungsaushöhlungssysteme. Nach den Erfolgen des SMR Index, gibt es verschiedene Unbestandigkeitsarten. Die Verbesserungsmaßnahmen, die fuer jede Art des SMR geeignet sind, sind beschrieben (Netze, Graben, Dentalbeton, Spritzbeton, Bolzen, Verankerungen, Wiederaushöhlung). Di. SMR Klassenordnung wurde in verschiedenen Fallen geprueft, worin Böschungen mit verschiedenen Unbestandigkeitsgraden von Verbesserungsmesssen bis Wiederaushöhlung. Zur Zeit ist das SMR Klassenordnungssystem ein nutzvolles Werkzeug, um das Böschungsrisiko zu analysieren.


BIENIAWSKI (1973) introduced the "Rock Mass Rating" (RMR) a new. ystem of rock mass classification, also known as CSIR classification. In the second version (BIENIAWSKI, 1976) five rock mass parameters were added to obtain the numerical RMR value. From this RMR value, a "rating adjustment for discontinuity orientations" (always a negative number) was substracted. In 1979 (BIENIAWSKI), the actual form of RMR rating was established (see Table 1). This classification is worldwide known, and systematically applied in tunnel studies to assess support needs.

BIENIAWSKI and ORR (1976), and SERAFIM and PEREIRA (1983) applied RMR to dam foundations, correlating the RMR value to the in situ modulus of deformation. KENDORSKI et al (1983) developed a new classification "Modified Basic RMR" (BMR) for mining with cawing methods.


In the 1976 version, the "rating adjustment for discontinuity orientations" for slopes was:

  • very favourable 0

  • favourable -5

  • fair -25

  • unfavourable -50

  • very unfavourable -60

No guidelines have been published for the definition of each class.

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