№83-6

Research and determination of the thickness of the protective screen made of crushed ore for ensuring structural integrity of barrier pillars during the transition from open-pit to underground mining of deposits

О. Shepel1 https://orcid.org/0000-0003-4581-5441

1Kryvyi Rih National University, Kryvyi Rih, Ukraine

Coll.res.pap.nat.min.univ. 2025, 83:65–76

Full text (PDF)

https://doi.org/10.33271/crpnmu/83.065

ABSTRACT

Purpose. Research, development, and study of protective screens made of crushed ore at the boundary with artificial or natural barrier pillars during the transition from open-pit to underground mining.

The methods. A multilateral research approach was applied, which included: a systematic review of literature sources to generalize knowledge about safe drilling and blasting operations; analysis of the physics of failure of the crushed ore protective screen at the boundary with the barrier pillar; numerical modeling using the finite element method; and statistical data processing using regression analysis.

Findings. The formation of protective screens was developed and studied, which significantly improve the conditions for the transition from open-pit to underground mining, ensuring the durability and reliability of artificial and natural barrier pillars. The parameters of the crushed ore protective screen were determined. The attenuation coefficient of stress wave amplitude during their propagation in the screening layer of the crushed ore protective screen at the boundary with the barrier pillar, which separates open-pit and underground mining operations, was investigated.

The originality. The dependence of the stress wave amplitude attenuation coefficient during their propagation in the screening layer of the crushed ore protective screen on the design thickness of the protective screen was substantiated. A quantitative characteristic of the dependence of the protective screen thickness made of crushed ore on the main influencing factors has been established. For the first time, the dependence of the granulometric composition coefficient of the crushed ore protective screen on the diameter of deep boreholes used to form the protective screen was established.

Practical implementation. Consists in the development and substantiation of the parameters of crushed ore protective screens that ensure the durability and reliability of artificial and natural barrier pillars during the transition from open-pit to underground mining. The determined dependencies enable mining enterprises to scientifically substantiate and optimize technological solutions required for the safe conduct of drilling and blasting operations at the boundary of open-pit and underground mining.

Keywords: drilling and blasting operations, deep boreholes, protective screen, mass blasting, barrier pillars, attenuation coefficient, stress wave amplitude, granulometric composition.

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date of first submission of the article to the publication  – 10/06/2025
date of acceptance of the article for publication after review – 11/08/2025
date of publication – 12/29/2025