Skipochka S., Krukovskyi O., Musiienko S., Serhiienko V. Study of stability of rocks beyond their strength limit under external local influences
- Details
- Parent Category: Geo-Technical Mechanics, 2025
- Category: Geo-Technical Mechanics, 2025, Issue 174
Geotech. meh. 2025, 174, 138-150
STUDY OF STABILITY OF ROCKS BEYOND THEIR STRENGTH LIMIT UNDER EXTERNAL LOCAL INFLUENCES
M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine
UDC 622.83:539.2
Language: English
Abstract. The subject of the research is deformation processes in rocks beyond their strength limits under targeted external local influences. The aim of the work is to determine the influence of individual physical and technological factors on the stability of the system "rock massif - mine working - support" beyond the strength limit of rocks to substantiate the parameters for controlling the geomechanical state of the specified system at great depths. Research methods: laboratory experimental studies, mathematical modeling, analysis and generalization of results. A set of experimental studies was carried out on high-rigidity testing equipment. Research modes: one-, two- and three-axial compression up to and beyond the strength limit with different options of external local impact. The object of research is specimens of sedimentary and rocky rocks. It is confirmed that beyond the strength limit, even local impacts with low energy are capable of changing the nature of rock deformation from pseudo-brittle fracture to pseudo-plastic flow. When deformation occurs beyond the strength limit, the most significant changes occur with the residual bearing capacity of rocks. The value of residual strength depends on the minimum stress component and the relative area of application of the local impact. To develop recommendations for the practical use of local impact effects, an elastic-plastic problem was solved, taking into account the "inclusion in work" of the marginal rock massif. It is shown that for mine workings at great depths or in conditions of fractured rocks, the active involvement of the marginal massif in the work and blocking the process of rock loosening are of primary importance. Control of rock massif destruction can be achieved by its spatial reinforcement with a system of anchors, injection of bonding solutions, spray concreting and plugging of cavities behind the support. To prevent loss of stability of the mine workings, local impact must be continuous. Therefore, reinforcement must be carried out using flexible anchors with constant or smoothly changing resistance. Since the maximum displacement occurs on the contour, it is advisable to locate the anchor flexibility unit on the surface of the mine working.
Keywords: rocks, deformation beyond the strength limit, stability of mine workings, support, targeted external local impact, types of impact, recommendations.
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About the authors
Skipochka Serhii, Doctor of Technical Sciences, Professor, Leading Researcher in Department of Rock Mechanics, 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. . (Corresponding author), ORCID 0000-0002-3996-5972.
Krukovskyi Oleksandr, Corresponding Member of the National Academy of Sciences of Ukraine, Doctor of Technical Sciences, Deputy Director, 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 0000-0002-2659-5095.
Musiienko Serhii, Candidate of Technical Sciences, Senior Researcher in Department of Rock Mechanics, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. . ORCID 0000-0003-2594-8554.
Serhiienko Viktor, Candidate of Technical Sciences, Senior Researcher in Department of Rock Mechanics, 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 0000-0002-7374-0654.