Method to predict rock displacements around development galleries at great depths in coal mining

The article discusses the method of softening and deformation stress prediction in enclosing rock mass in the influence zone of coal-face work and stress concentration assessment around development galleries with regard to the reaction force of mine roof support. The method is proposed to determine the size of the limiting state zone and to predict displacements around a development gallery in three problem formulations: formation of the limiting state zone with regard to the radial change in cohesion in the hydrostatic stress field; formation of residual strength and post-limiting state zones around development galleries; with regard to the pre-listed factors and including bedding and lamination in rock mass. It is found how the nonuniformity of enclosing rocks, their composition and structure, the mining depth and stress distribution influence the stress state behavior as well as the deformation with dilatancy of rock mass. The prediction method rests upon the analysis of numerous experimental observation data on rock displacements around development galleries. The developed geomechanical model of displacement prediction takes into account plastic softening and strength reduction in enclosing rock mass around development galleries in limiting and post-limiting states. Based on the comparison of theoretical and experimental results and using the revealed plastic dilatancy pattern, the method to predict displacements in limiting state and deformation zones in enclosing rock mass around development galleries is proposed.

Protosenya A. G., Tretenkov I. V., Tulin P. K., Shubin A. A. Method to predict rock displacements around development galleries at great depths in coal mining. MIAB. Mining Inf. Anal. Bull. 2024;(8):63-78. [In Russ]. DOI: 10.25018/0236_1493_2024_8_0_63.

A.G. Protosenya¹, Dr. Sci. (Eng.), Professor, e-mail: ProtosenyaAG@pers.spmi.ru, ORCID ID: 0000-0001-7829-6743,
I.V. Tretenkov¹, Cand. Sci. (Geol. Mineral.), Assistant Professor, e-mail: TretenkovIV@pers.spmi.ru, ORCID ID: 0000-0002-1104-8080,
P.K. Tulin¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: TulinPK@pers.spmi.ru, ORCID ID: 0000-0002-0820-4759,
A.A. Shubin¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: ShubinAA@pers.spmi.ru, ORCID ID: 0000-0002-1255-4743,
¹ Empress Catherine II Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

I.V. Tretenkov, e-mail: TretenkovIV@pers.spmi.ru.

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