PSI - Issue 32

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDir ct Structural Integrity Procedia 00 (2021) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000–000

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Procedia Structural Integrity 32 (2021) 71–78

© 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 work is devoted to numerical simulation of a stress-strain state in a shaft lining during thawing of a frozen wall. Calculations are carried out for sand stratum laying at the depth of 190 m. It has been shown that displacements in the shaft lining increase with the thawing of the frozen wall. After the thawing of the frozen wall plastic strains can occur in the concrete shell and cement grouted soil. Two possible ways of eliminating plastic strains in the concrete shell are considered in the work. Decrease in its stiffness induces vanishing of the plastic strains in the shell, but leads to a more significant deformation in the grouted sand. Increase in the shell thickness shows small plastic strain at the interface between the tubbing and the shell but prevents plastic deformation in the grouted soil. In addition, it has been obtained that increase in the thickness of the grouted soil induces rise in the optimal Young’s modulus of the shell and reduction of its optimal thickness. At the same time, increase in the thickness of the grouted soil has little effect on plastic deformation of the shell. © 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: AGF; vertical shaft sinking; cement grouting; thawing 1. Introduction In order to construct vertical mineshaft in weak, soft soil strata with high water content, special techniques need to be used to provide ground reinforcement and waterproof sealing. Artificial ground freezing is an effective and environmentally friendly technique that enables one to enhance the mechanical properties of soft soils and prevent XXIIth Winter School on Continuous Media Mechanics Calculation of the stress-strain state in a shaft lining during thawing of the frozen wall M. Zhelnin a, *, A. Kostina a , E. Esina b , O. Plekhov a a Institute of continuous media mechanics of the Ural branch of Russian academy of science, Ac.Koroleva st.,1, Perm, 614013, Russia b Perm national research polytechnic u iversity, Komsomolsky pro pect,29, Perm, 614990, Russia Abstract This work is devoted to numerical simulation of a stress-strain state in a shaft lining during thawing of a frozen wall. Calculations are carried out for sand stratum l ying at the depth of 190 m. It h s been own that displacements in the shaft lining increase with th thawing of the frozen wall. After the thawing of the frozen wall plastic s r ins can occur in the concrete shell and c ment grouted soil. Two possible ways of eliminating plastic strains in the concrete shell are considered in the work. Decrease in its stiffn ss induces vani h ng of the plastic strains in the shell, but leads to a mo signific nt deformation i gr uted sand. Increase in the hell thickness ows small plastic strain at t e interface between the tubbi g and th shell but prev nts plastic deformation grouted soil. In addition, it has been obtained that incr as in the thickness of the grouted soil induces rise in the optimal Young’s mo ulus of the shell and reductio f its optim l thickness. At the sam time, increase in the thickn s of the grouted soi has little effect on plastic d formation of the shell. © 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 re ponsibility of scientific committe of the XXIIth Winter School on Continuous Media Mechanics” Keywords: AGF; vertical shaft sinking; cement grouting; thawing 1. Introduction In order to construct vertical mineshaft in weak, soft soil strata with high water content, special techniques need to be used to provide ground reinforcement and waterpr of se ling. Artificial g ou d freezing is an effectiv and environmentally friendly techn que that enables one to enhance the mechanical properti s of soft soils and pr ve t XXIIth Winter School on Continuous Media Mechanics Calculation of the stress-strain state in a shaft lining during thawing of the frozen wall M. Zhelnin a, *, A. Kostina a , E. Esina b , O. Plekhov a a Institute of continuous media mechanics of the Ural branch of Russian academy of science, Ac.Koroleva st.,1, Perm, 614013, Russia b Perm national research polytechnic university, Komsomolsky prospect,29, Perm, 614990, Russia

* Corresponding author. Tel.: +7-342-237-8317; fax: +7-342-237-8487. E-mail address: zhelnin.m@icmm.ru * Corresponding author. Tel.: +7-342-237-8317; fax: +7-342-237-8487. E-mail address: zhelnin.m@icmm.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.2021.09.011