Optimization of parameters of overworked mining gallery support while carrying out long-wall face workings
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- Category: Mining
- Last Updated on 11 January 2018
- Published on 11 January 2018
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Authors:
V.O. Sotskov, Candidate of Technical Science, National Mining University, Associate Professor of the Department of Underground Mining, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.
Yu.I. Demchenko, Candidate of Technical Science, Associate Professor, National Mining University, Associate Professor of the Department of Underground Mining, Associate Professor, Dnipro, Ukraine
S.V. Salli, Candidate of Technical Science, National Mining University, Associate Professor of the Department of Underground Mining, Dnipro, Ukraine
N.I. Dereviahina, Candidate of Technical Science, National Mining University, Assistant of the Department of Hydrogeology and Engineering Geology, Dnipro, Ukraine
Abstract:
Purpose. The goal is to reach optimization of the supporting system of the Eastern intermediate drift of “Stepna” mine of DTEK Mine Office “Pervomaiske” to ensure reliable and effective maintenance of working over the entire life.
Methodology. Investigation and consideration of the geological conditions of mining and mining and technical features of overworking a single mine working when developing the overlying seam; conducting of computational experiments to determine the stress-strain state of the rock mass and support systems construction; rationale for the recommended support system parameters considering the use of “deep” strengthening of rocks.
Findings. The stress-strain state of rock, rock pressure manifestation and condition of maintaining workings depending on mining and processing parameters are investigated. Studies have established the rate of their impact on the effectiveness of applying support system at overworked workings. Eventually we have developed and justified recommendations for changing the supporting system, considering the use of “deep” strengthening of rocks. With respect to the estimated steel yield strength, the main length if racks is loaded on the level of 85‒94 % and is in a pre-limit state.
Originality. It is to establish the characteristics of changes in the stress state of the rock mass and the degree of influence of the bearing pressure zone in front of the long-wall face onto the underlying area.
Practical value. We have developed recommendations for efficient and reliable supporting of the Eastern intermediate drift of “Stepna” mine of DTEK Mine Office “Pervomaiske” allowing the features of supporting of overworked workings.
References
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