PSI - Issue 28

ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceD rect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 28 (2020) 693–701

© 2020 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 European Structural Integrity Society (ESIS) ExCo Abstract Cement grouting is widely applied in geotechnical engineering to reinforce water saturated soil and to control groundwater. The present paper is devoted to a numerical study of cement grout injection in a soil stratum during a construction of a vertical mine shaft using the artificial ground freezing (AGF) technology. For the study a thermo-hydro-mechanical model was developed. The governing equations of the model are derived based on the theory of porous media. The model takes into account the features of AGF and grouting processes such as a non-Newtonian behavior of cement grout flow, water-ice phase change and an influence of pore pressure and temperature on an evolution of a stress-strain of the soil. Three-dimensional numerical simulation of cement grouting of unfrozen soil between the shaft lining and the ice-soil wall was conducted using the model for various injection regimes. Results of the simulation have shown that the grout injection leads to a rise in temperature and volumetric strain in the soil. A mechanical impact of the injection procedure on the shaft lining is an increase in the mechanical pressure near the injection boreholes and a redistribution of the von Mises stress. © 2020 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 European Structural Integrity Society (ESIS) ExCo Keywords: artificial ground freezing; grouting; shaft sinking; thermo-hydro-mechanical model 1. Introduction Potash deposits are characterized by great depth of an occurrence. To elaborate the deposits vertical mine shafts is sunk in a rock mass under hard hydrogeological conditions through aquifers and weak soil stratums. The artificial 1st Virtual European Conference on Fracture Numerical simulation of cement grouting of saturated soil during a mine shaft sinking using the artificial ground freezing M. Zhelnin a *, A. Kostina a , O. Plekhov a , L. Levin b a Institute of continuous media mechanics of the Ural branch of Russian Academy of Science, Ac. Koroleva st.,1, Perm, 614013, Russia b Mi ing institute of the Ural Branch of Russian Academy of Science, Seberian st.,78a, Perm 614007, Russia Abstract Cement grouting is widely applied in geotechnical engineering to reinforce water saturated soil and to control groundwater. The pr se t paper is devote to numer cal study of cement grout inject on in a soil str m during constructi n of a vertical min shaft using the artificial gr und fr ezing (AGF) technolo y. For the study a thermo-hydro-mechani al model was de loped. Th governing equations of the model are derived based on the theory of porous media. The model takes int account the features of AGF and gro ting pr cesses such s a non-Newtonian be avior of cement grout flow, water-ice pha e change and an influence pore pressure a d temp rature on n ev lution f a stress-strain of th soil. Three-dimensional numeric l simulation of cement grouting of unfrozen soil betw en the shaft lini g and the ice-soil wall wa conduct d using the model fo v rious injection regi s. Res lts of the simulation hav shown that the rout inje tion eads to a rise in mperatur and volumet c strain in the soil. A m chanical impact of the inj ction procedur on the shaft lining is an increase in the m chanica pr ssure near the injection bore oles and a redistributio of the von Mises stress. © 2020 The Author . Publ shed 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 e European Structural Integri y So i ty (ESIS) ExC K ywords: artificial ground freezing; grouting; shaft sinking; thermo-hydro-mechanical model 1. Introduction Potash deposits are characterized by great depth of an occurrence. To elaborate the deposits vertical mine shafts is sunk in a rock mass unde hard hydrogeological c nditi ns through aquifers nd weak s il tratums. The arti icial 1st Virtual European Conference on Fracture Numerical simulation of cement grouting of saturated soil during a mine shaft sinking using the artificial ground freezing M. Zhelnin a *, A. Kostina a , O. Plekhov a , L. Levin b a Institute of continuous media mechanics of the Ural branch of Russian Academy of Science, Ac. Koroleva st.,1, Perm, 614013, Russia b Mining institute of the Ural Branch of Russian Academy of Science, Seberian st.,78a, Perm 614007, 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 © 2020 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 European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 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 European Structural Integrity So i ty (ESIS) ExCo

2452-3216 © 2020 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 European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.080