№82-5

Structural design of a resource-efficientsupport system for preparatory mine workings

V. Ruskih¹,    https://orcid.org/0000-0002-5615-2797

O. Haidai¹,    https://orcid.org/0000-0003-0825-0023

I. Filippov¹,   https://orcid.org/0009-0009-3905-865X

S. Poimanov¹https://orcid.org/0000-0002-2932-2498

¹Dnipro University of Technology, Dnipro, Ukraine

Coll.res.pap.nat.min.univ. 2025, 82:55-64

Full text (PDF)

https://doi.org/10.33271/crpnmu/82.055

ABSTRACT

Purpose. Justification of the parameters of a resource-saving support system for preparatory workings, which ensures increased stability of the contour zone of the rock mass under complex geomechanical conditions characteristic of seam deposits in the Western Donbas.

The methods. The study employs a comprehensive approach encompassing theoretical analysis of the stress-strain state of the rock mass, graphical-analytical determination of the optimal working cross-sectional shape, modeling of two-level support systems, and evaluation of their effectiveness under mining pressure and reuse conditions.

Findings. The decisive influence of the cross-sectional shape on the stability of preparatory mine workings was established. The feasibility of using a semi-elliptical cross-section oriented with the major axis along the direction of the principal vertical stress was substantiated. This approach reduces stress concentration along the contour of the working and ensures uniform distribution of mining pressure. An improved support design was proposed in the form of a two-level frame-anchor system, combining short anchors for the contour zone and long cable anchors for stabilizing deeper rock layers. The technical solution is complemented by mesh reinforcement, pressure plates, and metal props, which enhance the overall stiffness and load-bearing capacity of the support. For complex mining-geological conditions with elevated pressure, an adaptive scheme using friction props and hydraulic elements capable of responding to load changes was developed, promoting increased safety in working operation.

The originality. The design of the support system for a preparatory mine working has been further developed, featuring a comprehensive interaction between the load-bearing and supporting elements and the rock mass. A relationship has been established between the load-bearing capacity of the mesh used for tightening the inter-frame space of the mine support and the parameters of its structural elements. A methodology for applying the proposed support design under underground conditions is presented.

Practical implementation. The proposed support system increases the stability of workings in complex geological conditions, reduces the metal intensity of structures, enhances operational safety, and allows for the reuse of preparatory workings, thereby promoting resource conservation and reducing mining production costs.

Keywords: support systems, anchor system, mining pressure, rock mass stability, resource conservation.

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