Аннотация:The purpose of the research – to analyse the effect of a complex lithological structure on the stability of mine workings. The relevance of the work. The need to take into account complex geological structure is one of the most important factors affecting the stability of rock outcrops. By this we mean the lithological structure and the presence of lithological heterogeneities. The difference in physical and mechanical, and particularly deformation properties, between lithologic alterations and host rocks can lead to unfavorable rock pressure conditions during excavation and operation. The research’s methods. In this work, we study rock mass behavior in the presence of lithologic inhomogeneities with different characteristics using spatial numerical models. Using geological data and rating techniques, the transition from physical and mechanical properties of the sample to the properties of the massif is done. The results of the work and its area of application. The work provides an overview of the occurrence of lithological heterogeneities, and of lithology as a factor influencing the stability of mine workings. Moreover, numerical models with different physical and mechanical properties of dikes were built and analyzed and the actual section of the mine workings underlain by a monkeit dike was taken for the analysis of the influence of lithological differences on the stability of mine workings. Conclusion. The simplification and idealization of massif as a continuous medium leads to loopholes in stressstrainstate of massif
