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

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Procedia Structural Integrity 32 (2021) 202–208

© 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 In case of significant deformation of salt rocks around mine openings traditional methods of preventing potash mines from flooding, such as backfilling, sometimes can’t guarantee the preservation of waterproof stratum (WPS) integrity. One of the possible methods to prevent water inflow into mine workings is injection of grouting material in order to create antileakage screen ensuring waterproofing of fault zone in WPS. Methodical approaches to estimation of pressure from grouting contribution into alteration of WPS stress-strain state are discussed and main problem statements are introduced in the paper. The use of suggested approaches is illustrated for the case of hazardous situation at south-east part of BKRU-4 mine (Berezniki, Russia). Mathematical modelling of different scenarios of grouting material injection and rock mass response in the concerned area were held out and maximum safe pressure of grout pumping were found. © 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: potash mining; mathematical modelling; tamping wellbore 1. Introduction The inflow of weakly saturated brines and fresh water in mine openings can be considered as a main reason for potash mines collapse (Prugger and Prugger, 1991; Whyatt and Varley, 2008: Shokin, 1969; Warren, 2017; Laptev, 2009, Baryakh et al. 2013). It is usually preceded by fracture formation that goes through the whole of WPS overlying mined layer. The most common method for prevention of fault zone appearance is backfilling which decreases maximum possible subsidence and hence limits rock deformation in the vicinity of mined areas. The XXIIth Winter School on Continuous Media Mechanics Estimation of Antileakage Grouting Influence on Waterproof Stratum Integrity A. K. Fedoseev a1 a Mining Institute of the Ural Branch of the Russian Academy of Science, 78-a, Str. Sibirskaya, Perm, 614007, Russia Abstract In case of significant deformation of salt rocks around mine openings traditional methods of preventing potash mines from flooding, such as backfilling, sometimes can’t guara tee the preservation of waterproof stratum (WPS) integrity. O o the p ssible met od to preve t water inflow i to mine workings is injection of grouting material in order to create antileakage screen nsuring water roofing of fault z ne i WPS. Methodical approaches to estimation of p essure from grouting co tribution into alt ratio of WPS stress-strain state are discussed an main blem statements are introd c d in the paper. The use f suggest d appr aches is illu trated for the case of hazardous situation at south-east part of BKRU-4 mine (Berezniki, R sia). Mathematical modelling of different scenario of grouting material njection and rock mass response in the conc rned area were held out and maximum safe pressure of grout pumping were found. © 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: potash mining; mathematical modelling; tamping wellbore 1. Introduction The inflow of weakly saturated brines and fresh water in mine openings can be considered as a main reason for potash mines c llapse (Prugger and Prugger, 1991; Whyatt and Varley, 2008: Shokin, 1969; W rren, 2017; Laptev, 2009, Baryakh et al. 2013). It is usually preceded b fracture formation that goes through th whole of WPS overlying mined layer. The most common metho for p evention of fault zone appearance is backfil ing which dec eases aximum possible subsidence and hence limits rock def rmation i the vicinity of mined areas. The XXIIth Winter School on Continuous Media Mechanics Estimation of Antileakage Grouting Influence on Waterproof Stratum Integrity A. K. Fedoseev a1 a Mining Institute of the Ural Branch of the Russian Academy of Science, 78-a, Str. Sibirskaya, Perm, 614007, Russia

* Corresponding author. Tel.: +7-342-216-4688; fax: +7-342-216-7502 E-mail address: rm_anton@mi-perm.ru * Corresponding author. Tel.: +7-342-216-4688; fax: +7-342-216-7502 E-mail address: rm_anton@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 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 under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” 10.1016/j.prostr.2021.09.029