rmi description
Why the RockMass index (RMi) system ?
Construction materials commonly used in civil engineering are mostly characterized by their strength properties. In rock engineering, however, no strength characterization of the rock mass is in common use. Most engineering is carried out using various descriptions and classifications based mainly on observations in addition to unspecified experience. Hoek and Brown (1980), Bieniawski (1984), Nieto (1983) and several other authors have, therefore, indicated the need for a strength characterization of rock masses. The Rock Mass index, RMi, system has been developed to meet this need.
Ø A short introduction to Rock Mass index (RMi) and its applications
Ø Characterizing rock masses by the RMi for use in practical rock engineering, presented in the
following two papers: Part 1: The development of the Rock Mass index (RMi)
Part 2: Some practical applications of the Rock Mass index (RMi)
Ø A full description of the RMi is given in the Ph.D. thesis.
Some interesting descriptions of rock mass features are presented in its Appendices.
Ø Application of RMi in rock support estimates is shown in the paper Recent developments in
rock support estimates by the RMi
The last development is the Combined rockmass classification system where the input parameters to the RMR, Q and RMi systems have been combined into one set of input parameters, common to them all. See 'Classification and Characterization'.
Construction materials commonly used in civil engineering are mostly characterized by their strength properties. In rock engineering, however, no strength characterization of the rock mass is in common use. Most engineering is carried out using various descriptions and classifications based mainly on observations in addition to unspecified experience. Hoek and Brown (1980), Bieniawski (1984), Nieto (1983) and several other authors have, therefore, indicated the need for a strength characterization of rock masses. The Rock Mass index, RMi, system has been developed to meet this need.
The development of RMi
The concept of RMi was first presented at the Norwegian National conference on Rock mechanics (Bergmekanikkdagen) in 1986. This was partly a further development of the Volumetric joint count (Jv), which had been presented in several papers since 1975. The practical developments of the RMi were made in 1991 to 1995 through the PhD. thesis RMi – a rock mass characterization system for rock engineering purposes . Since 1995, the RMi has been applied in several projects. Some developments and simplifications of the RMi rock support method are presented in 2000. In addition, a few minor errors have been corrected since the RMi system was published in 1995.Descriptions and papers on the RMi
You can find more on RMi in the following descriptions and papers:Ø A short introduction to Rock Mass index (RMi) and its applications
Ø Characterizing rock masses by the RMi for use in practical rock engineering, presented in the
following two papers: Part 1: The development of the Rock Mass index (RMi)
Part 2: Some practical applications of the Rock Mass index (RMi)
Ø A full description of the RMi is given in the Ph.D. thesis.
Some interesting descriptions of rock mass features are presented in its Appendices.
Ø Application of RMi in rock support estimates is shown in the paper Recent developments in
rock support estimates by the RMi
The last development is the Combined rockmass classification system where the input parameters to the RMR, Q and RMi systems have been combined into one set of input parameters, common to them all. See 'Classification and Characterization'.
