### WELCOME TO THE ROCKMASS WEBSITE

FOR INFORMATION AND COMMUNICATION IN THE FIELDS OF- ENGINEERING GEOLOGY
- ROCK MECHANICS
- ROCK ENGINEERING AND DESIGN

## Estimations with RMi

**A. Estimate of rockmass properties**

1. Estimates of rockmass strength. As shown in papers on RMi, the RMi-value approximately gives the uniaxial compressive strength of a rockmass. The RMi-value can be found from:

- calculations as given, for instance in the tag ‘Papers on RMi‘, or
- a graphical method to calculate the RMi-value, or
- the computer spreadsheet RMi Calculation, or
- the computer spreadsheet Combining the RMR, Q and RMi systems

2. Estimate of deformation modulus as described in the paper The deformation modulus – comparisons between in situ tests and indirect estimates.

3. Estimate of input parameters to Hoek-Brown failure criterion for rockmasses as described in the Ph.D. thesis on RMi.

For measurements of jointing features, see the tag ‘*Joints and jointing‘* and the paper on seismic velocities.

Rock support is also described in the introduction paper to RMi. The RMi support charts are presented here.

**B. Estimate of rock support**

The RMi is used in rock support as described in several papers, see the tag ‘*Papers on RMi‘*, especially the paper Recent developments in rock support estimates by the RMi.

The estimate of rock support can be found by application of the computer spreadsheet on Rock support