<p>Rock Quality Designation (RQD), was introduced by Don Deere in the mid-1960s as a means of using diamond core to classify rock for engineering purposes. Subsequently it was incorporated into the Rock Mass Rating and Q-system classification methods which, ...

Specific correlations developed to predict the Rate of Advance for open TBMs, double-shields and single-shields, using the RME index are presented.

<p>The paper describes the selected significant developments, with the emphasis on the following findings: Charts are presented for more accurate determination, of the five input parameters of the RME, using graphical representation. New expressions to evaluate ...

After 35 years of use throughout the tunnelling world, the RMR and Qclassifications have proved themselves on numerous projects. They stillface misconceptions however, as reflected in recent articles in T&amp;TInternational. Here, Nick Barton, of Nick Barton ...

This paper presents the result of comparison between the modulus of deformation obtained from dilatometer tests and the geomechanical quality of the rock mass using the RMR classification and the basic intact rock properties such as uniaxial compressive strength ...

This paper presents the result of comparisons between the modulus of deformation obtained from dilatometer tests and the geomechanical quality of the rock mass using the RMR classification ant the basic intact rock properties such as the uniaxial compressive ...

Over 500 case histories were analysed in two years to bring the Rock Mass Excavability (RME) index to fruition and demonstrate its effectiveness on five current projects. It should be emphasised that the RME index does not replace the RMR or Q systems as used ...

This paper presents the result of comparisons between the modulus of deformation obtained from dilatometer tests and the geomechanical quality of the rock mass using the RMR classification and the basic intact rock properties such as the uniaxial compressive ...

<p>The results of studies of the initiation and propagation of fracture from a single Griffith crack in a biaxial compressive stress field are reported in this paper.</p>