PSI - Issue 32

ScienceDirect Available online at www.sciencedirect.com Sci nceD rect 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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 32 (2021) 117–123

© 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 Within the Verkhnekamskoye salt deposit, productive sylvinite layers are mined using chambers supporting the overlying strata with pillars of various sizes, which stability is determined by mechanical properties of rocks, mining depths, a mining plan of layers, sizes of chambers, etc. The bearing capacity of the interchamber pillars is largely influenced by conditions of the roof and soil of the chambers and, especially, by the technological interlayer. The presence of thin clay interlayers reduces the rocks stability of the roof of underground structures and causes its intense lamination and caving of the interlayer rocks, thus, increases the height of the interchamber pillars and decreases their bearing capacity. The paper presents estimates of changing loads of the pillars during the lamination of the roof of the stoping of the lower productive layer, which is obtained by the multivariate mathematical modeling of the stress-strain state of the two-layer chamber block taking into account the main features of the geological structure and geometry of the mines. The calculations were carried out for the conditions of the plane strain state. The stress state of the chamber block was described by an ideal elastoplastic medium. The thin-layered medium was described using Goodman joint elements. © 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” Keywords: Salt mining; Mathematical modeling; Stress-strain state, Joints elements; Destruction; Interlayer lamination 1. Introduction In the Verkhnekamskoye salt deposit (VSD), productive sylvinite layers are mined using the pillar mining system with the support of the overlying strata by pillars of various sizes. The interval of productive layers, especially the XXIIth Winter School on Continuous Media Mechanics Estimating the influence of the technological interlayer lamination on stability of the goaf supporting elements I S Lomakin*, A A Tsayukov Mining Institute of the Ural Branch of the Russian Academy of Science,Siberian, 78a, Perm, 614007, Russian Federation Abstract Within the Verkhnekamskoye salt deposit, productive sylvinite layers are mined using chambers supporting the overlying strata with pillars of various sizes, which stability is de ermined by mechanical properties of rocks, mining depths, a mining plan of layers, sizes f chambers, tc. T e bearing capacity of th interchamber pi la s is largely influenced by conditions of the roof and soil of th chambers and, especially, by the techn logical interlayer. The pre ence of thin clay interlayers reduces the rocks tability of the roof of underground structures and causes its nse lamination and caving of the interlayer rocks, thu , increase the height of the interchambe pillar and d creases their bearing cap city. The paper presents est mates of changing loads of the pillars during the lamin tion of the roof of the stoping of the lower productive layer, which is obtained by the multivariat mathematical modeling of the stress-strain stat of the two-layer chamber block t king into accoun th main f atures of th geological structur a d geometry of the mines. The calculations were carried ut for the co ditions of the plane str in state. T stress state of the ch mber block was d scrib d by an ideal elastoplasti m ium. The thin-layered medium was described using Goodm n j in elements. © 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 scientific committe of the XXIIth Winter School on Continuous Media Mechanics” Keywords: Salt mining; Mathematical modeling; Stress-strain state, Joints elements; Destruction; Interlayer lamination 1. Introduction In the Verkhnekamskoye salt deposit (VSD), productive sylvinite layers are mined using the pillar mining system with t support of the v rlying strata by pillars f variou sizes. The inte val of productive layers, especially the XXIIth Winter School on Continuous Media Mechanics Estimating the influence of the technological interlayer lamination on stability of the goaf supporting elements I S Lomakin*, A A Tsayukov Mining Institute of the Ural Branch of the Russian Academy of Science,Siberian, 78a, Perm, 614007, Russian Federation

* Corresponding author. Tel.: +7-342-225-0050; fax: +7-342-216-7502. E-mail address: Lomakin@Mi-Perm.ru * Corresponding author. Tel.: +7-342-225-0050; fax: +7-342-216-7502. E-mail address: Lomakin@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 o f 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 o f 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.2021.09.017