PSI - Issue 32

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

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

ScienceDirect

Procedia Structural Integrity 32 (2021) 187–193

XXIIth Winter School on Continuous Media Mechanics The study of silvinite and carnallite deformations under instaneous XXIIth Winter School on Continuous Media Mechanics The study of silvinite and carnallite deformations under instaneous

and sustained loading Аrtem Udartsev*, Ivan Pankov Mining Institute of the Ural Branch of the Russian Academy of Sciences 78a Sibirskaya St, Perm, Perm Krai 614007, Russian Federation and sustained loading Аrtem Udartsev*, Ivan Pankov Mining Institute of the Ural Branch of the Russian Academy of Sciences 78a Sibirskaya St, Pe m, Perm Krai 614007, Russian Federatio

© 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 paper deals with laboratory studies of deformations of sylvinite and carnallite at the Gremyachinskoe potassium salt deposit including conditional instaneous loading experiments on uniaxial and volumetric compression and long-term tests under various loads. According to the study results, indicators of the conditional instaneous loading and creep curves were obtained, which were used to determine the long-term strength and the rate of steady-state creep. It has been specified how the lateral pressure and the degree of loading influence the long-term strength and rate of steady-state creep. © 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 W inter School on Continuous Media Mechanics” Keywords: sylvinite, carnallite, creep, uniaxial and volumetric compression, long-term strength 1. Introduction The Gremyachinskoye potash deposit (GPD), located in the Kotelnikovsky district of the Volgograd region, is one of the largest potash ore deposits in Russia. The deposit is mined in difficult geological conditions with the depth of the salt rocks of 1100-1300 m. The productive stratum is represented by sylvinite, and the enclosing rocks are carnallite, rock salt and dolomite-anhydrite rocks. The mining process is complicated by a high water cut of the overlying strata with the danger of groundwater penetration into the mine openings. It is planned to provide safe mining operations by using the pillar mining system with supporting interchamber pillars operating in the creep Abstract The paper deals with laboratory studies of deformations of sylvinite and carnallite at the Gremyachinskoe potassium salt deposit including conditional instane us loading experi ents on uniaxial and volumetric compression and long-t rm te ts under vari us loads. Ac rding to the study results, indicators of the co dit on l instaneous loading and creep curves wer obtain d, which were used to determin the long-term streng h and the rate of ste dy- te creep. It has been specified ho the la eral pressure and the degree of loading inf uenc the long-term strength and ra of ste dy-state creep. © 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 u der responsibility of h scientific committe of the XXIIth W inter School on Continuous Media Mechanics” K ywords: sylvi it , carnallite, creep, uniaxial and volumetric compression, long-term strength 1. Introduction The Gremyachinskoye potash deposit (GPD), located in the Kotelnikovsky district of the Volgograd region, is one of the largest potash ore deposits n Russia. The deposit is mined in difficul geological conditions with the depth of the salt rocks of 1100-1300 m. The productive stratum is represe ted by sylvinite, and the enclo ing rocks are carnallite, rock salt and dolomite-anhydrite rocks. The mining proc s is complicated by a high water cut of the overlyi g s rata with he anger of groun water penetration into the mine openings. It is planned to p ovide saf mining oper tions by using th pilla mining syst m with supporting i t rchamber pillars operating in the creep

* Corresponding author. Tel.: +7-951-955-73-83. E-mail address: udartsev@mi-perm.ru * Corresponding author. Tel.: +7-951-955-73-83. E-mail address: udartsev@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 u der responsibility of t scientific committe 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.2021.09.027