Вестник МГТУ, 2021, Т. 24, № 2.

Вестник МГТУ. 2021. Т. 24, № 2. С. 214-227. DOI: https://doi.org/10.21443/1560-9278-2021-24-2-214-227 In the left side of Fig. 9, the overhanging "visors" of rock with unspecified stability are clearly visible. Fig. 9. The result of the collapse of the hanging parts of the site (shown in Fig. 7) (photo by V. Shekov) Рис. 9. Результат обрушения свисающей части площадки (рис. 7) (фото В. Шекова) It has been found that within one year deformations accumulate in the workings of the Ruskeala Mining Park and some sections are moved, moreover they can collapse in the future. Nevertheless, during an year they are quite stable. This approach based on modeling the walls, assessing their fracturing and deformations makes it possible to identify the most dangerous areas with an interval of at least 1 time per year. In the interval between these procedures, it is necessary to control the behavior of cracks by other methods. Studying the condition of the quarries the underground part o f the Ruskeala Mining Park has been examined as well. The underground part of the Park includes two galleries with a total length of about 180 m leading to a large marble hall with powerful pillars (Fig. 1, the right picture) up to 20 m height which by two-thirds o f their height are hidden under the water. Fig. 10. Model of the underground space of the Ruskeala Mining Park (model prepared by V. Shekov) Рис. 10. Макет подземного пространства Рускеальского горного парка (модель В. Шекова) 221