The role of classification in rock engineering and design is discussed. It is important to distinguish between characterization, classification and empirical design method. The classification systems used today should, strictly speaking, either be described ...

Three methods of in situ deformation modulus (Em) measurements of rock masses have been described, analysed and compared. The plate jacking (PJT) test, where the deformations are measured by extensometers in drill holes, gives generally the best results. A ...

The RMi (rock mass index) system applies input of block size, joint characteristics and strength of intact rock to express the uniaxial compressive strength of a rock mass. From practical use in more than 5 years the RMi rock support method has been further ...

The RMi system is based on defined inherent parameters of the rock mass and is obtained by combining the compressive strength of intact rock and a jointing parameter. The jointing parameter represents the main jointing features, namely block volume (or density ...

The Rock Mass index, RMi, has been developed to satisfy a need for a strength characterization of rock masses for use in rock engineering and design. The method gives a measure of the reduction of intact rock strength caused by discontinuities given by RMi ...

The RMi system is based on def,rned inherent rock mass parameters. Basically, it combines the compressive strength of intact rock and a jointing parameter (JP) in the expression RMi :JP represents the main jointing features, namely block volume (or density ...

The RMi (rock mass index) system is based on well defined inherent rock mass parameters. Basically, it combines the compressive strength of intact rock and a jointing parameter composed of 4 jointing characteristics, namely block volume or densþ of joints, ...