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The author considers the problem of studying engineering-geological conditions, estimation of stability of rock massifs, forecast of development of engineeringgeological processes on the example of the Upper-Aliyinsk deposit. Optimization of the construction of mining enterprises and the process of mining of minerals requires a substantiated assessment of the engineering-geological conditions (EGC) of mineral deposits at the exploration stage: the separation of the main components of the EGC, the determination of the processing processes, the assessment of the scale of their impact, and the forecasting of mining operations in the development of the deposit. Among the main components that require assessment in engineering and geological studies are geological structure of the massif, structural-tectonic features and fracturing, composition and properties of rocks, development of exogenous geological processes, hydrogeological conditions. The analysis of the engineering-geological conditions of the Upper-Aliyinsk deposit made it possible to identify the most significant components, such as the fracturing of rocks and their strength properties, so the author based the classification on the "classification of rocks by the degree of fracture" VSEGINGEO with some additions caused by the specificity of the object under study. The taxonomic unit for zonation was the engineering-geological sections, the basis of which is the qualitative and quantitative assessment of the degree of fracturing of rocks, the evaluation of the strength properties of rocks and their engineering-geological typification. In engineering-geological zoning, the author distinguished 4 categories in the rock massif with different degrees of stability: I – high stability; II – medium stability; III – low stability; IV – very low stability. The share of very stable breeds is from 44.46 to 61.58 %, stable – from 11.98 to 39.8 %. Breeds of low stability are less common – from 5.56 to 15.74 %. Unstable breeds are extremely rare and their share is 3.97 %. An objective assessment of all the components that make up the engineering-geological conditions of the Upper-Aliyinsk deposit will make it possible to make the most correct and objective forecast.

Assessment of rock mass stability and forecast of development of engineering-geological processes at the Upper-Aliyinsk deposit