Abstract
Purpose.Determination of the rock stability along the strike of the mass, where the drift mining of the horizon -480 m is conducted, considering the possibility of using the improved types of supports in the conditions of the 10th Anniversary of Kazakhstan’s Independence mine at the Khromtau field with the substantiation of using the effective type of fastening that increases technical and technological, operational and economic indicators of the mine. Methods. Numerical modelling of the stress-strain state of the rock mass applied at the mine have been performed using the RS2 software in a two-dimensional formulation. The rock mass state, as well as the physical-mechanical properties of mine rocks are determined according to building codes and regulations (SNiP II-94-80), depending on the category of the rock stability. Findings. It has been revealed that the combined supports from rock bolts and shotcrete are the most rational type of fastening in the studied mine. The efficiency and prospects of using the combined supports have been determined, which ensure a decrease in their material consumption and cost while increasing the reliability of mine workings and the labor productivity of miners. The use of combined support allows to increase the economy of materials for support by 1.7 times, as well as to increase the drifting rate by 1.6 times in comparison with the metal support. Originality.The paper proposes a new approach to substantiation of an effective fastening method by comparing the costs when driving horizontal underground mine workings in the mining-and-geological conditions of the 10th Anniversary of Kazakhstan’s Independence mine. Practical implications.The research results can be used when planning mining operations, in particular, stable fastening methods at the 10th Anniversary of Kazakhstan’s Independence mine of the Khromtay deposit, as well as other mining enterprises with similar mining-and-geological conditions.
Highlights
IntroductionThe near-term and long-term prospects for the mining industry development in Kazakhstan are inextricably linked with the intensification of technological processes for the extraction of mineral raw materials, in which the maintanence of a wide-area network of preparatory workings (both main and zonal) in proper operational state is a very urgent and important scientific-technical task
An increase in the competitiveness of coal mining is directly related to a decrease in the final product cost in terms of the main items of expenditure, among which the costs for maintaining the mine workings are of great importance [1], [2].The near-term and long-term prospects for the mining industry development in Kazakhstan are inextricably linked with the intensification of technological processes for the extraction of mineral raw materials, in which the maintanence of a wide-area network of preparatory workings in proper operational state is a very urgent and important scientific-technical task
Serpentinites through dunites are widespread in the deposits of the 10th Anniversary of Kazakhstan’s Independence mine
Summary
The near-term and long-term prospects for the mining industry development in Kazakhstan are inextricably linked with the intensification of technological processes for the extraction of mineral raw materials, in which the maintanence of a wide-area network of preparatory workings (both main and zonal) in proper operational state is a very urgent and important scientific-technical task. The 10th Anniversary of Kazakhstan’s Independence mine is located in the north of Mugalzhar, on the eastern slope of the East Kempirsay ore district, in the south-eastern part of Khromtau City, Aktobe region, Republic of Kazakhstan. To the 10th Anniversary of Kazakhstan’s Independence mine, the mines of Donskoy Ore Mining and Processing Plant, Voskhod Mine, the 20th anniversary of the Kazakh S.S.R. Mine and Poiskovoye open-pit mine are developing chromite deposits.
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