Krukovska V.V., Krukovskyi O.P. Formation of the near-face stress field under the influence of natural and technological factors

Details

Parent Category: Geo-Technical Mechanics, 2023

Category: Geo-Technical Mechanics, 2023, Issue 165

Geoteh. meh. 2023, 165, 97-116

https://doi.org/10.15407/geotm2023.165.017

 

FORMATION OF THE NEAR-FACE STRESS FIELDUNDER THE INFLUENCE OF NATURAL AND TECHNOLOGICAL FACTORS

Krukovska V.V., Krukovskyi O.P.

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

UDC 622.831.3

Language: English

Abstract. The mine face is a high-risk zone, where a loss of stability, an occurrence of dynamic and gas-dynamic processes, and an increase in the content of harmful gases are possible. All these negative consequences to certain extent depend on the near-face stress field. This article presents the results of numerical study of the peculiarities of its time-dependent formation in rocks with different properties, when using such means of reducing the outburst hazard as water injection and unloading cavities.
It is shown that with the course of time in the rocks around the mine working, the area of increased difference of the stress tensor components spreads, which leads to the formation of cracks of varying degrees of intensity. The maximum component of the stress tensor increases; the abutment pressure zone is formed in the near-face region. The simultaneous increase of vertical stress in the abutment pressure zone and unloading of horizontal stress leads to displacement of the coal seam in the mine working and loss of the mine face stability. If the mine working is driven through hard rocks, Q^* parameter values, as well as the maximum vertical stresses in the abutment pressure zone, are significantly increased. The zone of inelastic deformations begins to form with a long delay and has noticeably smaller dimensions. Hard rocks can withstand greater difference of the stress tensor components and greater vertical loads without breaking.
Coal moistening leads to a significant decrease in the difference of the stress tensor components in the near-face zone of the coal seam. Values of Q^* parameter in moistened coal in the three-meter near-face zone is 1.5–5 times lower than in the coal seam with a natural moisture content. The growth of the abutment pressure zone in moistened coal slows down; the zone of inelastic deformations becomes somewhat larger. The near-face stresses in the mine working with the unloading cavity is radically different from the previous cases. The peak values of Q^* parameter and maximum stress are moved to the depth of unloading cavity. At the same time, both the difference of the stress tensor components and the maximum stress remain at a low level, which corresponds to moistened coal and in a long time interval ensures deformation of the near-face zone in the elastic mode. Unloading of this zone from rock pressure occurs in two directions: in the direction of the mine face and in the direction of the unloading cavity.
Keywords: mine face, time-dependent stress field, moistening of coal seam, unloading cavity, numerical simulation.

 

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About the authors:

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.

 Krukovskyi Oleksandr Petrovych, Corresponding Member of NAS of Ukraine, Doctor of Technical Sciences (D. Sc), Deputy Director of the Institute, 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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