PSI - Issue 32

ScienceDirect cienceDirect Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com vailable online at .sciencedirect.com Procedia Structural Integrity 32 (2021) 173–179

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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.2021.09.025 2452-3216 © 2021 N.A. Samodelkina. 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 o f the XXIIth Winter School on Continuous Media Mechanics” 2452-3216 © 2021 N.A. Samodelkina. 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 o f the XXIIth Winter School on Continuous Media Mechanics” © 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 This paper deals with the study of the stress-strain state of the rock mass undermined by stoping and having a geological anomaly. The problem is solved in an elastoplastic formulation. The numerical implementation is based on the finite element method. Conditions of the contact opening between the layers of the waterblocking strata and the overlying water-saturated horizons are specified. The proposed approach makes it possible to determine the parameters for the development of water soluble minerals that ensure the safety of mining operations and protect mines from flooding Keywords: geological anomaly; dilatancy; deformation of contacts of salt rocks; waterblocking strata 1. Introduction The exploitation of potash ore has a number of restrictions on mining parameters (height and width of stopes, width of inter-chamber pillars, etc.), whichensure safe mining operations, as well as extraction efficiency. In the regulations [Instructions,(2014)], the safety criterion is mainly connected to the preservation of the continuity of the waterblocking stratum (WS), which is a waterless and water-tight part of the geological section located above the roof of the upper mined layer. In the anomaly zone in the structure of the WS, the mining works are either not effected at all or have great restrictions. Restrictions of the mining parameters within the areas of the anomalies in the WS structure do not often have strict geomechanical justifications. This is related to certain difficulties in adequately formulating and solving Abstract This paper deals with the study of the stress-strain state of the rock mass undermined by stoping and having a geological anomaly. The problem is solved in an elastoplastic formulation. The numerical implementation is based on the finite element method. Conditions of the contact opening between the layers of the waterblocking strata and the overlying water-saturated horizons are specified. The proposed approach makes it possible to determine the parameters for the development of water soluble minerals that ensure the safety of mining operations and protect mines from flooding Keywords: geological anomaly; dilatancy; deformation of contacts of salt rocks; waterblocking strata 1. Introduction The exploitation of potash ore has a number of restrictions on mining parameters (height and width of stopes, width of inter-chamber pillars, etc.), whichensure safe mining operations, as well as extraction efficiency. In the regulations [Instructions,(2014)], the safety criterion is mainly connected to the preservation of the continuity of the waterblocking stratum (WS), which is a waterless and water-tight part of the geological section located above the roof of th upper mi ed layer. In the anomaly zone in the structure of the WS, the mi ing works are either not ffected at all or have great stric . Restri ti of the mining paramet rs within the areas of the anomalies in the WS structure do not of en hav stri t geomechanical justifications. This is rel te to c rtain difficulties in adequately formulating and solving XXIIth Winter School on Continuous Media Mechanics TheInfluence of Geological Anomalies on the Stability of Waterblocking Strata XXIIth Winter School on Continuous Media Mechanics TheInfluence of Geological Anomalies on the Stability of Waterblocking Strata N.A. Samodelkina * N.A. Samodelkina * Mining Institute of the Ural Branch of the Russian Academy of Science, Russia * Corresponding author. Tel.: +7-342-225-0050; fax: +7-342-216-7502. E-mail address: samodelkina@mi-perm.ru Mining Institute of the Ural Branch of the Russian Academy of Science, Russia * Corresponding author. Tel.: +7-342-225-0050; fax: +7-342-216-7502. E-mail address: samodelkina@mi-perm.ru