PSI - Issue 32

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2021) 000 – 000

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Procedia Structural Integrity 32 (2021) 42–48

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” Abstract The Verkhnekamskoe deposit of potassium-magnesium salts was used as an example of modeling the destruction of rock mass taking into account the history of its deformation (a retrospective analysis). The method of the geomechanical estimation of changes in the stress-strain state of the salt mass over time was considered using the elastoplastic approach for the conditions of the plane strain state. The influence of the deformation history of the rock mass on safe mining operations was estimated both for the current and long-term predictions with displacements progressing over time, taking into account the Mohr-Coulomb criterion relations and ultimate tensile stresses. We analyzed the prospects for the formation of sub-vertical jointing zones in the undermined mass, which play the key role in the formation of the undermined stratum of water conducting channels along the section. It is shown that without the retrospective analysis, the geomechanical estimation of the rock strata destruction is not always adequate for a current situation of deformation and can lead to overestimated values of the stability of the rock mass, which is unacceptable for safe mining. © 2021 The Authors. Pub lished by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific comm ittee of the XXIIth Winter School on Continuous Media Mechanics” Keywords: Mathematical modeling; Rock mass; Subsidence curve; Technogenic disturbance; Retrospective analysis. 1. Introduction The Verkhnekamskoye deposit of potash and magnesium salts is one of the largest in the world. Mining operations are carried out here using the pillar mining system with the support of the overlying rock mass and the earth’s surface with inter-chamber pillarsensuring safe operations of the mine for a long time and the safety of Abstract The Verkhnekamskoe deposit of potassium-magnesium salts was used as an example of modeling the destruction of rock mass taking into account the history of its defor tion (a retrospective analysis). The method of the geom chanical estimation of cha es in the stress-strain state f the salt ass over time was considered using the elastoplastic approach for the conditions t e plane strain state. The influ nce of the deformation history of the rock ma s on saf mining operations was estimate b th f r curr nt and long-term predictions with isplacements progressing ver time, taking into acc unt the Mohr-Coulomb criteri n relations and ultima tensile stres es. We analyzed the prospects for he formatio f sub-vertical jointing zones in the undermined mass, which play the key role in the formation of th unde min d stratum of water conducting channels along section. It is shown that without th retrospective analysis, the geomechanical estimati n of the rock strata destruction is not always adequate for a current situation of d formation and can lead to overestimated values of the stability of the rock mass, which is unacceptable for safe mining. © 2021 The Authors. Pub lished by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific comm itte of the XXIIth Winter School on Continuous Media Mechanics” Keywords: Mathematical modeling; Rock mass; Subsidence curve; Technogenic disturbance; Retrospective analysis. 1. Introduction The Verkhnekamskoye deposit of potash and magnesium salts is one of the largest in the world. Mining operations are carried out her u ng the pillar mining system with the support of the ov rly g rock mass and the earth’s surf ce with inter-chamber pillarsensuring safe op rations of the mine or a long t me and the afety of XXIIth Winter School on Continuous Media Mechanics The Influence of the Deformation History on the Location of Rock Destruction E.A. Gubanova* Mining Institute of the Ural Branch of the Russian Academy of Science, 78-a, Str. Sibirskaya, Perm, 614007, Russia XXIIth Winter School on Continuous Media Mechanics The Influence of the Deformation History on the Location of Rock Destruction E.A. Gubanova* Mining Institute of the Ural Branch of the Russian Academy of Science, 78-a, Str. Sibirskaya, Perm, 614007, Russia

* Corresponding author. Tel.: +7-342-225-0050; fax: +7-342-216-7502. E-mail address: Elena.T@mi-perm.ru * Corresponding author. Tel.: +7-342-225-0050; fax: +7-342-216-7502. E-mail address: Elena.T@mi-perm.ru

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer- review under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer- review under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics”

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” 10.1016/j.prostr.2021.09.007