Investigating the interaction of geomechanical factors influencing the underground mining method selection using fuzzy DEMATEL method

In the occurrence of geomechanical risks in underground mines, not only one factor, but a set of factors are closely related to each other. Therefore, choosing a suitable underground mining method and studying the relationship and interaction between the geomechanical and geological factors affecting it, before starting the mining process, can maximize profit and recovery, increase productivity, reduce production costs and ore losses, and finally create a safe environment for underground miners. Therefore, according to the importance of the subject, in this research, using the fuzzy DEMATEL method, the structure governing the factors was analyzed from the point of view of their influence and how they relate to each other, and also the importance of them. To implement this technique, first questionnaires were designed and distributed among experts, then 18 questionnaires were received to evaluate the factors. Finally, by implementing this method, the vectors of R, C, R+C, and R-C were calculated for each factor. The results show that the factors of discontinuity spacing and geological structures of the deposit have the highest (cause factors), and the criteria of Rock Mass Rating (RMR) and rock mass deformation modulus have the lowest impact (effect factors), respectively. The causal diagram drawn for the geomechanical factors influencing the underground mining method selection and the occurrence of geomechanical risks in underground mines, also shows that the Rock Mass Rating (RMR) factor has the highest prominence value and therefore has the most importance among all other parameters.