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Purpose. The aim of this paper is to develop a numerical model to investigate the stability of Angouran underground mine batching room, in which appropriate support systems are selected, designed, and compared to choose the most optimal case.Methods. Stability analysis is carried out by critical shear strain criterion using finite element method (FEM). The effect of support system on the stability of batching room has been determined for two types of composite support systems: one, incorporating rock bolt and shotcrete, and the other, comprising steel frame with one-meter distancing and shotcrete, based on comparing the displacements around stopes with the amount of critical and allowable strains resulted from Sakurai criterion.Findings. The results of the analysis show that the excavation of the batching room without a support system causes its instability and failure, so it is imperative to design a suitable support system according to the geomechanical and stress conditions of the area. Comparison between the two selected support systems also shows that there is not much difference between these two support systems and in both cases, batching room stability can be provided.Originality. A wide range of parameters involved in the calculation were explored. Results suggest that the failure strain seems to be a promising tool when used correctly. Considerable time saving can be achieved without losing accuracy.Practical implications. Numerical methods can be utilized to analyze tunnels with non-circular cross-sections, considering heterometric ground conditions around the tunnel, often heterogeneous in situ stresses, rock mass behavior and tunnel face effects. By selecting suitable rock failure criteria, it is possible to identify weaknesses around the excavations via numerical modeling and design an appropriate support system based on it.

Stability analysis and support system design of Angouran underground mine batching room