Abstract
A classification system called “Slope Mass Rating” (SMR) system was proposed to evaluate the stability of rock slopes. SMR is obtained from Bieniawski's Rock Mass Rating (RMR) by subtracting adjustment factors of the joint-slope relationship and adding a factor depending on method of excavation, where RMRbasic is evaluated by adding parameters. The stability of slope depends upon length of joints along slope. Slope mass rating is being used successfully for landslide zonation in rocky and hilly areas. Though the SMR accounts for planar and toppling failures in rock slopes, in the case of wedge failure it takes into consideration different planes forming the wedges and analyzing the different planes individually. The unstable wedge is a result of combined effect of the intersection of various joints. In the modified SMR approach, the same method is applicable for planar failures and the strike and the dip of the plane are used for the analysis. But in the case of wedge failures, the plunge and the direction of line of intersection of the unstable wedge are used.
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