Mining of Mineral Deposits

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Innovative approaches to stabilizing underground mine workings in unstable rock masses by creating a preliminary protective shield

Yerkin Iskakov1, Dikhan Amanzholov1, Zhandos Kenessov1

1Satbayev University, Almaty, Kazakhstan


Min. miner. depos. 2025, 19(2):65-74


https://doi.org/10.33271/mining19.02.065

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      ABSTRACT

      Purpose. The research is aimed at developing the technology for chemical strengthening of mine workings using epoxy reagent to create a protective shield in unstable zones of rock masses, as well as at assessing the strength of the strengthened areas and improving the stability of mine workings.

      Methods. During the research, core samples extracted from the epoxy reagent-strengthened mass were tested to assess their strength and resistance to external influences. Numerical modeling was performed in ANSYS Mechanical 14.5 to analyze the stress-strain state of strengthened and non-strengthened areas.

      Findings. Tests of core samples taken from the Akbakai mine showed that failure mainly occurs in the zones of contact between the rock and the adhesive composition, with the share of new fractures not exceeding 15%. The adhesion strength was 0.15 MPa, which is three times higher than that of non-strengthened rock. The results of modeling confirmed the reduction of stresses and displacements in strengthened zones by 2-3 times compared to non-strengthened ones, which indicates the high efficiency of the proposed method to improve the stability of mine workings.

      Originality. For the first time, an innovative method of chemical strengthening of mine workings with the use of protective epoxy shield, which significantly increases the stability of the mass when conducting mine workings under the influence of mineral salts and external loads, has been substantiated.

      Practical implications. The developed technology of chemical strengthening of mine workings with the use of protective epoxy shield has a high practical significance for the mining industry. Its application will significantly improve the stability of rock masses, especially in unstable zones exposed to the influence of mineral salts, which contributes to improving the safety and durability of mine workings, reducing the risks of caving and cleavage, as well as increasing the efficiency of mining-tunneling operations.

      Keywords: mine workings, mass stability, arch caving, chemical strengthening, adhesion strength, modeling


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