Zubkov A. V., Feklistov Iu. G., Sentiabov S. V. Special characteristics of stress-strain state development in a concrete support of Donskoy and Gaisky GOKs shafts. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2019; 4: 12–23 (In Russ.). DOI: 10.21440/0536-1028-2019-4-12-23

Research aims to examine the stress-strain state (SSS) in Donskoy and Gaisky GOKs shafts concrete support. Donskoy GOK experienced spontaneous destruction of shafts support in the early 1980s. The largest rock inrushes were recorded in the skip-cage and cage shafts of mine Tsentralnaia with 4 examined shafts, and 2 shafts at mine Molodezhnaya. To forecast the stability of shafts and prevent emergency, support SSS development has been examined since 2013 at Gaisky GOK.
Research methodology. Shaft stability problem has conditioned the need to solve the task of SSS level determination together with strength characteristics in a concrete support. For the first time in national practice, the parameters of shaft support SSS and their variation monitoring have been determined through slot stress relief – an advanced method of measuring relief strains. Laboratory study and analytical simulation methods were also used.
Results analysis. It has been determined that SSS irregular distribution in the support around the shaft perimeter is conditioned by stress field anisotropy in the rock mass. At the same time, the position of the zones with the largest inrush agrees well with the maximum compressive stresses acting in the support and in the surrounding rock mass.
Conclusions. It is proposed to use the main identified provisions in practice, namely: the stress state of mine shaft supports is formed as a function of their design parameters, the total tensor of gravitationaltectonic stresses acting in the rock mass at the time of the start of research and time variables determined by natural and analytical methods. It is also necessary to take into account the physical and mechanical properties of the rock mass and concrete of the support.

Key words: concrete support of shafts; stress-strain state; inrush; stability; slot relief; relief strain; physical and mechanical properties.

Acknowledgements: the research has been carried out under UB RAS Program for basic research, project no. 18-5-5-51.

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