Authors: V.S. Onuprienko, A.A. Eremenko, Yu.N. Shaposhnik, A.I. Kopytov

Title of the article: Selection of types and parameters of supports in the conditions of underground mining of apatite-nepheline deposits

Year: 2023, Issue: 2, Pages: 56-70

Branch of knowledge: 2.8.6. Geomechanics, destruction of rocks by explosion, mine aerogasdynamics and mining thermophysics

Index UDK: 622.8

DOI: 10.26730/1999-4125-2023-2-56-70

Abstract: Due to the increase in ore production and the depth of mining operations, the issues of maintaining workings under high stress conditions are becoming of great importance, since it is also associated with an increase in the volume of capital, preparatory and extraction workings both in and outside the extraction zone. The stability of the workings is ensured through the use of reinforced concrete and monolithic concrete slabs, as well as lightweight types of supports. However, the choice of the type of support is influenced by mining-geological and geomechanical features of rocks, development technologies, especially at the Kirovsky ore mine, which works out two deposits of apatite-nepheline ores. The purpose of this study is to select the types and parameters of supports during the processing of apatite-nepheline ores to ensure the safety of mining operations. Using the numerical modeling and experimental studies of the mining engineering system of the Kirovsky ore mine, the State Research Institute of the Russian Academy of Sciences has determined the values of the greatest stresses that have a significant impact on the choice of the type of workings support. The parameters of the support are calculated with the determination of the size of the disturbed zone around the workings. The parameters of the light types of supports are considered: their rational number, length, cross-section, material characteristics, etc. are revealed, depending on the fracturing of the array, the parameters of the workings, the category of the state of the workings, etc. A rating system developed by N. Barton is given, which evaluates the influence of factors such as strength, depth of development, cross-section of workings and the stressed state of the array, the number and condition of cracks. A nomogram is given for choosing the type and parameters of the support relative to the Q-rating and the span of the development. The indicator of the rock quality RQD is given.

Key words: ore deposit development system mine working support fracturing anchor shear stress

Receiving date: 23.03.2023

Approval date: 10.05.2023

Publication date: 15.06.2023

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