Slashchov І.M., Slashchovа O.A., Osinniy V.Ya., Sapunova I.O., Konstantynova I.B. Identification of risk factors of mine workings stability loss

Details

Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 149

Geoteh. meh., 2019, 149, 209-222

https://doi.org/10.15407/geotm2019.149.209

 IDENTIFICATION OF RISK FACTORS OF MINE WORKINGS STABILITY LOSS

¹Slashchov І.M., ¹Slashchovа O.A., ¹Osinniy V.Ya., ¹Sapunova I.O., ¹Konstantynova I.B.

 ¹Institute of Geotechnical Mechanics named by N. Polyakov NAS of Ukraine

UDC 622.831.31 : 622.112.3

Language: Ukrainian

Annotation.  

Destruction of the rock massif during mining operations leads to loss of the mine-working stability and affects safety and traumatism of workers. In order to solve the problem of reducing the risks of mine-working stability loss, first of all, we need to assess stress-strain state and time destruction of the rock massif with taking into account the most important peculiarities of its structure and physical-mechanical properties. This, in turn, requires identification of the dominant factors affecting the risks of the rock massif destruction and loss of mine-working stability. The purpose of this work was to substantiate and systematize the dominant factors that create different risks for the system "rock massif – mine working" during the work of mining enterprises. The dominant geological, mining and engineering groups of factors, which featured causal relationships with activation of geomechanical processes and affected the risks of stability loss in the mine support systems, were systematized. Initial conditions and identification parameters were determined for various groups of dominant geological risk factors: low natural strength of rocks, tectonic disturbances and fracturing of rocks, concentration of maximum stresses, excessive gas pressures, flooding of rock masses. The dominant risk groups (and consequences), which were associated with activation of geomechanical processes, were substantiated: expansion of zones with inelastic deformations (rock slip, grown loads on supports and activation of rock stratification); activation of gas-dynamic processes (gas emission into the mine workings, sudden outpouring or outbursts and other consequences); propagation of main cracks (a dramatic decrease in stability and sudden displacements of roof and floor in the mine roadways, sudden caving, dynamic loads on supports, inrush of groundwater); increase of stress concentration (destruction of rocks and supports); activations of rock displacements (sudden roof subsidence and floor swelling in the mine workings, deformation of supports); destruction of supporting systems (personal injury, disturbances of ventilation modes, gas contamination of mine workings). In order to identify risks of the mine-working stability loss under the effect of factor of rock mass flooding, dependencies were established, which determined decrease of strength parameters, changes in variation coefficients and the risks caused by decreased strength of the flooded rocks. This allows determining risks of dangerous conditions occurrence in the rock massif at different depths and water saturation levels and at minimum rock strength parameters in dry and flooded conditions. Timely identification of the factors affecting the risks of mine-working stability loss improves safety of work during the operation of mining enterprises.

Keywords: risk factors, mine workings stability, geomechanical processes, labor safety.

References

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About the authors:

Slashchov Ihor Mykolayovych, Candidate of Technical Sciences (Ph.D), Senior Researcher, Senior Researcher in the Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Polyakov NAS of Ukraine (IGTM, NAS of Ukraine), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Slashchovа Olena Anatoliyivna, Candidate of Technical Sciences (Ph.D), Senior Researcher, Senior Researcher in the Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Polyakov NAS of Ukraine (IGTM, NAS of Ukraine), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Osinniy Valentyn Yakovych, M.Sc., Researcher in Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Polyakov NAS of Ukraine (IGTM, NAS of Ukraine), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Sapunova Iryna Oleksandrivna, Candidate of Technical Sciences (Ph.D), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Polyakov NAS of Ukraine (IGTM, NAS of Ukraine), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Konstantynova Iryna Borysivna, Master of Science, Lead Engineer in the Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Poliakov NAS of Ukraine (IGTM, NAS of Ukraine), Dnіpro, This email address is being protected from spambots. You need JavaScript enabled to view it.

 

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