Slope Mass Rating for Design of Jointed Rock Slopes In Opencast Mines

摘要

The Slope Mass Rating (SMR) system is an extension of the RMR approach, for specific application to rock slopes. This paper presents the application of SMR to ten Indian limestone, manganese, coal and copper mines to verify its suitability. As part a of Science and Technology project sponsored by Ministry of Coal & Mines, Govt. of India the results were critically examined keeping in view the actual field conditions. It was found that SMR predictions are not in consequence with field conditions at the mines studied. This calls for modification to the SMR system. Therefore a modified slope mass rating (MSMR) system based on studies in ten mines was developed. From application of MSMR in the above mines it was established that MSMR of 50 and above indicates stable slopes, and the value below 40 indicates instability. When the MSMR was used for the actual cases, the designed bench slope angles were coming within 10 percent variation as compared to the results of numerical / limit equilibrium analyses.