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 ...

An example is shown how systematic application of engineering geological data and construction aspects can be combined to assess the amount of rock support and tunneling progress for a tunnel.

Norwegians have a long tradition in underground work which is clearly exhibited in Oslo. Although a small (500,000 inhabitants) and fairly spacious city, with variable rock quality, the underground is utilised to a large extent. The ever increasing focus on ...

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 ...

A case history related to rock design and construction is the documentation of ground conditions and experience gained from the construction of the structure and its behaviour during usage. Also documentation of test results as well as results from back analysis ...

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, ...

A rock mass is a material quite different from other structural materials used in civil engineering. It is heterogeneous and quite often discontinuous, but is one of the materials in the earth's crust, which is most used in man's construction. This chapter ...

Small scale tunneling for oil has been performed onshore since the turn of the century. In the late 1970s and in the 1980s, several proposals were set froth for using subsea tunnels in the exploitation of offshore oil and gas fields. This article describes ...