Short on the RMR (Rock Mass Rating) system . This engineering classification system, which was developed by Bieniawski in 1973, utilises the following six rock mass parameters: 1. Uniaxial compressive strength of intact rock material. 2. Rock quality designation (RQD). 3. Spacing of discontinuities. 4. Condition of discontinuities , given as

The following six parameters are used to classify a rock mass using the RMR system: 1. Uniaxial compressive strength of rock material. 2. Rock Quality Designation (RQD). 3. Spacing of discontinuities. 4. Condition of discontinuities. 5. Groundwater conditions. 6. …

RMR classification guide for excavation and support in rock tunnels. Tunnel shape: horseshoe; width: 10m. Vertical stress: below 25MPa. 2. Good rock. 3. Fair rock. 4. Poor rock. 5. Very poor rock. Systematic bolts 5 - 6m long, spaced 1 - 1.5m in …

Rock mass classification schemes have been developing for over 100 years since Ritter (1879) attempted to formalise an empirical approach to tunnel design, in particular for determining support requirements.

A Rock Mass Rating (RMR) calculator based on continuous functions - jagadishkundu/QuickRMR

called the Rock Mass Rating (RMR) system. The classification can be used for estimating the unsupportedspan, the stand-uptime or bridge action period and the support pressures ofan underground opening, It canalso be used for selecting a method of excavation and permanent support system. Further, cohesion, angle of internal friction and elastic

This document contains information for classifying rock mass strength based on parameters such as intact rock strength, discontinuity spacing and conditions, groundwater, and orientation. It provides rating scales for each parameter and describes how to calculate an overall rock mass class based on the total ratings.

This spreadsheet combines three numerical systems - the Q system, RMR system, and RMi system - for estimating rock support in tunnels. It contains input fields to provide parameter values for each system, which are then used to calculate classification values for …

This spreadsheet combines three numerical rock mass classification systems: the Q system, RMR system, and RMi system. It contains input fields to describe tunnel/rock mass parameters like rock strength, jointing characteristics, groundwater conditions, and stress levels.

A spreadsheet has been worked out to easily find the RMR, Q and RMi values from the set of combined parameters shown in Part 1. This has been used to work out comparisons between the three system s, which are