Stress–strain analysis of vertical shaft lining and adjacent rock mass under conditions of irregular contour

The mathematical modeling is used to analyze the influence of the irregular shaft contour on the stress nonuniformity in adjacent rock mass and at the shaft lining. In mine shaft construction, the final profile of the lining is often imperfect. At the irregular contour of the lining, redistribution of loading takes place, which leads to the stress concentration and adversely affects the lining efficiency. At the present time, in solving such problems in geomechanics, it is uncommon to consider the contour irregularity explicitly, but the rise in the computational capabilities makes the latter possible. The modeling embraces three scenarios of stress distribution at the contour of the vertical shaft lining at different conditions. It is found that the stress level in adjacent rock mass is governed by the geometry of the lining contour irregularity and by the orientation of the principal stress vector. The qualitative correlation of the irregularity geometry and tangential stresses at the lining contour, as well as the relation of plastic strains and the irregularity geometry are obtained. It is impossible to completely avoid the contour irregularity at this stage of the mining industry. For this reason, it is required to calculate carefully explosive charges, and to take into account geology and tectonics of a mineral deposit, and many other factors.

Demenkov P. A., Romanova Е. L., Kotikov D. A. Stress–strain analysis of vertical shaft lining and adjacent rock mass under conditions of irregular contour. MIAB. Mining Inf. Anal. Bull. 2023;(11):33-48. [In Russ]. DOI: 10.25018/0236_1493_2023_11_0_33.

P.A. Demenkov¹, Dr. Sci. (Eng.), Professor, Dean of Construction Department, e-mail: demenkov_pa@pers.spmi.ru, ORCID ID: 0000-0003-1599-8080,
Е.L. Romanova¹, Graduate Student, e-mail: s215064@stud.spmi.ru, ORCID ID: 0000-0002-4448-4292,
D.A. Kotikov¹, Cand. Sci. (Eng.), Senior Researcher, Research Center of Geomechanics and Mining Problems, e-mail: Kotikov_DA@pers.spmi.ru,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

E.L. Romanova, e-mail: ekaterina.romanova.1997@mail.ru.

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