Slashchov І., Slashchovа O., Seleznov A., Shmyhlov V., Kryvenko Ye., Brizheniuk V. Justification of the parameters of injection rock hardening zones around mining workings and buried structures of critical infrastructure

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Parent Category: Geo-Technical Mechanics, 2024
Category: Geo-Technical Mechanics, 2024, Issue 170

Geoteh. meh. 2024, 170, 165-180

 

JUSTIFICATION OF THE PARAMETERS OF INJECTION ROCK HARDENING ZONES AROUND MINING WORKINGS AND BURIED STRUCTURES OF CRITICAL INFRASTRUCTURE

1Slashchov І., 1Slashchovа O., 1Seleznov A., 2Shmyhlov V., 2Kryvenko Ye., 2Brizheniuk V.

1M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine

2Ukrainian State University of Science and Technologies

UDC 622.831.312: 614.87

Language: English

Abstract. The article is devoted to the substantiation of the parameters of hardened zones around mine workings and buried structures of critical infrastructure, taking into account the established patterns of changes in the stress-strain state of rocks. The purpose of the work is to determine the rational shapes and sizes of injection rock hardening zones to increase the stability and operation safety of mine workings and buried structures. Methods: analysis and generalization of data on rock deformation; mine observations; mathematical modeling of geomechanical processes using the finite element method. The features of rock deformation and of underground workings and structures stability loss were analyzed. It was established that rock hardening compensates for the drawbacks of traditional supporting systems without significantly increasing costs. At the same time, the use of various configurations of rock hardening zones allows the supporting system to be adapted to specific conditions, minimize stress concentrations, prevent local collapses, and stabilize the rock mass. The criteria for the effectiveness of injection hardening technology are two main indicators: a reduction of rock volumes that will be deformed with an increase of structural defects, and a decrease in stress concentration. A comparative analysis of hardening zones of various forms showed that the maximum reduction in the volume of inelastic deformation zones up to 85% was obtained when using a smoothed elliptical configuration and up to 71% - when using a scheme with increased coverage of the side parts of the roof. The method of adaptive design of hardening zones was further developed, when shape of hardening zone corresponds to the locality of the forecasted zones of inelastic deformations and has the smoothest boundaries. The adaptive approach assumes that the strengthening zones should not be strictly geometric or unified. On the contrary, they are planned in such a way as to correspond as much as possible to the real conditions of inelastic deformation of the massif with taking into account the variation of the rocks properties, the depth of occurrence, the expected dynamics of stress changes and watering of rocks. This allows locally increasing the strength of rocks, reducing fracturing, preventing the penetration of gases and water into the workings or structure.

Keywords: stability of workings and structures, safety of structures operation, injection hardening of rocks, stress-strain state, geomechanical processes. 

 

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About the authors:

Slashchov Ihor, Doctor of Technical Sciences (D. Sc), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. ORCID 0000-0002-2432-9092

Slashchovа Olena, Candidate of Technical Sciences (Ph. D), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. ORCID 0000-0002-7161-1410

Seleznov Anatolii, Master of Science, Principal Specialist in Rock Mechanics Department, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. ORCID 0000-0001-5737-2903

Shmyhlov Vitalii, Master of Science, Postgraduate Student in Department of Labor Protection, Civil and Technogenic Safety, Ukrainian State University of Science and Technologies, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. ORCID 0009-0005-9159-0775

Kryvenko Yevhen, Master of Science, Postgraduate Student in Department of Materials Science and Materials Processing, Ukrainian State University of Science and Technologies, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. ORCID 0009-0002-4110-268X

Brizheniuk Volodymyr, Master of Science, Postgraduate Student in Department of Labor Protection, Civil and Technogenic Safety, Ukrainian State University of Science and Technologies, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. ORCID 0009-0003-9690-1056