Krukovskyi O.P., Krukovska V.V., Kurnosov S.А., Yanzhula O.S., Bulich Yu.Yu. Study of permanent workings stability when they are driven through the gob of relieving longwall
- Details
- Parent Category: Geo-Technical Mechanics, 2023
- Category: Geo-Technical Mechanics, 2023, Issue 165
eoteh. meh. 2023, 165, 51-63
https://doi.org/10.15407/geotm2023.165.051
STUDY OF PERMANENT WORKINGS STABILITY WHEN THEY ARE DRIVEN THROUGH THE GOB OF RELIEVINGLONGWALL
1Krukovskyi O.P., 1Krukovska V.V., 1Kurnosov S.А.,2Yanzhula O.S., 1Bulich Yu.Yu.
1M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, 2Coal Directorate METINVEST HOLDING LLC
UDC 622.831.24
Language: English
Abstract. The method of permanent workings construction, the type of supporting, as well as their location relatively to the boundaries of stopping operations zones greatly affect their stability. In this work, a numerical simulation of the stress state of the layered rock mass with permanent workings located in the gob of previously mined longwall was completed to study these mine workings stability outside the influence of stopping operations and in the zone of their influence. As an example, the mining and geological conditions were considered for the central panel of block 11 in PJSC Colliery Group "Pokrovske", where four permanent mine workings are planned. A series of calculations were performed with variations of such technological parameters as the distance between mine workings, the impact of stopping operations, and the pillar size between the gob of the relieving longwall and the active front of working face.
It is shown that a change in the distance between permanent mine workings in the range of 50–70 m does not affect the lack of mutual influence between these mine workings. When the front of stopping operations in the adjacent longwall approaches the permanent workings, the load on the support pillar between the boundary of stopping operations and the gob of relieving longwall, as well as on support of first permanent mine working, increases considerably. If the support pillar size is 80 m, the impact of the stopping operations spreads close to the first permanent working and affects the stability of the second permanent working. The approach of active longwall leads to an additional lowering of the first mine roof by 120–208% compared to the level at the stage of stabilization of the stress-strain state. The region of increased difference in main stresses around the first permanent working occupies a large area; its stability deteriorates, although thanks to the bolting, the monolithic rock-bolt arch is still preserved in its roof. However, the pillar size of 80 m is critical (for the mining and geological conditions adopted in this work); further reduction of the pillar size will lead to loss of stability of the first permanent mine working. An increase in the depth of permanent workings by 300 m, in addition to a natural increase in the initial stress state of the rock mass, also leads to a 10–12% increase in the boundaries of the influence of the abutment pressure.
Keywords: gob of relieving longwall, numerical simulation, rock bolting, stopping operations, support of permanent workings.
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About the authors:
Krukovskyi Oleksandr Petrovych, Corresponding Member of the NAS of Ukraine, Doctor of Technical Sciences (D. Sc), Deputy Director of the Іnstitute, 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.
Krukovska Viktoriia Viktorivna, Doctor of Technical Sciences (D. Sc), Senior Researcher, Senior Researcher in Department of Pressure Dynamics Control in Rocks, 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.
Kurnosov Serhii Anatoliovych, Doctor of Technical Sciences (Sci.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.
Yanzhula Oleksii Serhiovych, Candidate of Technical Sciences (Ph.D.), Director for Technical Development and Investments, Coal Directorate METINVEST HOLDING LLC, Pokrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Bulich Yurii Yuriiovуch, Master of Science, 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.
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