Discussion on “GIS-based kinematic slope instability and slope mass rating (SMR) maps: application to a railway route in Sivas (Turkey)” by Işık Yilmaz, Marian Marschalko, Mustafa Yildirim, Emek Dereli and Martin Bednarik, Bulletin of Engineering Geology and the Environment 71 (2012), 351–357, doi:10.1007/s10064-011-0384-5
We read the original paper entitled ‘‘GIS-based kinematic slope instability and slope mass rating (SMR) maps: application to a railway route in Sivas (Turkey)’’ by Yilmaz et al. (2012), Bulletin of Engineering Geology and the Environment. The paper shows the potential use of kinematic stability and slope mass rating (SMR) maps using a geographical information system (GIS). However, there are several aspects in the paper regarding the SMR geomechanical maps elaboration that are debated on this note. As the authors explain in their paper, SMR (Romana 1985) is a slope geomechanical classification based on Bieniawski’s ( 1989) classification. This geomechanical index is computed adding to basic Rock Mass Rating (RMR) index, calculated by characteristic values of the rock mass, several geometrical correction factors ( F 1, F 2, F 3) and a fourth factor ( F 4) depending on the excavation method, respectively. Focusing our attention on F 1, F 2 and F 3parameters, we can see that these parameters are...
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