Geomechanical assessment and substantiation of mining conditions and mining method for Irtysh deposit

Zhirnov, A. A.; Shaposhnik, Yu. N.; Неверов, С. А.; Nikol’sky, A. M.

doi:10.17580/gzh.2018.01.08

Cited by 3 publications

(1 citation statement)

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“…It is necessary to have a clear understanding of the mutual spatial occurrence of certain rock types with the corresponding deformation-strength properties [9], [10] In other words, to solve geomechanical problems, it is necessary to develop various situation models. This methodological approach is gradually gaining general recognition [11].…”

Section: Introductionmentioning

confidence: 99%

Rock mass management to ensure safe deposit development based on comprehensive research within the framework of the geomechanical model development

Sedina¹,

Altayeva²,

Shamganova³

et al. 2022

Min. miner. depos.

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Purpose. To create and study a three-dimensional geomechanical model in order to determine the parameters of the open-pit walls and benches, ensuring safe and economically feasible mining, as well as predicting unstable zones within the open pit. Methods. A comprehensive methodological approach is used, including a systematic analysis of scientific, normative and methodological literature; analyzing the results of previously performed studies on the object; engineering-geological surveys in the near-edge rock mass of the Kurzhunkul’ deposit; laboratory testing of rock strength properties; determining the rock mass rating according to the MRMR classification; kinematic analysis of bench faces; calculating the stability of the Kurzhunkul’ deposit final boundary using the limit equilibrium method; numerical modeling of the rock mass stress-strain state at the Kurzhunkul’ deposit using the finite element method. Findings. The paper represents the results of data collection and analysis for the development of a geomechanical model of an operating iron-ore open pit in the Republic of Kazakhstan. Comprehensive geomechanical studies to substantiate the optimal parameters of the Kurzhunkul’ deposit walls and benches on the limiting contour, as well as calculations to determine the degree of the open-pit walls and benches stability have been performed. Based on the results of studying the geological-structural configuration of the deposit, as well the mathematical modeling data of stability and acting stresses, subsequently entered into a unified digital database, weakened zones have been identified. Originality. For the first time, the geomechanical model has been created for the conditions of the Kurzhunkul’ deposit, which makes it possible to combine in one database all the parameters that affect the safety of mining operations. The model takes into account structural disturbances of the rock mass that have an adverse impact on stability. Practical implications. The developed model gives a visual representation of the rock mass state at various sites of the deposit, simplifies the selection of design sections for stability calculations, facilitates the choice of optimal technical solutions and analysis, especially for complex geological structures with multiple geotechnical or geological units with different texturing and inclination.

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Section: Introductionmentioning

confidence: 99%

Rock mass management to ensure safe deposit development based on comprehensive research within the framework of the geomechanical model development

Sedina¹,

Altayeva²,

Shamganova³

et al. 2022

Min. miner. depos.

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Stress–strain analysis of rock mass during mining of protective pillar of vertical shaft

Неверов

Shaposhnik

Nikolsky

2020

IOP Conf. Ser.: Earth Environ. Sci.

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The implemented studies aim at the geomechanical assessment of safe mining, including safety pillars, within the limits of the protective pillar of shaft RESH in the Irtysh Mine, with estimation of influence exerted by stresses and strains on the rock mass, permanent excavations and ground surface. Slacked replenishment of the raw material resources makes re-extraction of ore reserves from pillars highly topical. It is found that ore loss in mining of the protective pillars reach 30% and above of total reserves at some deposits. Based on the analytical solutions and 3D FEM modeling in terms of the Irtysh Mine, the authors validate feasibility of safe partial extraction of ore reserves from the protective pillar of shaft RESH without aggravating effect on the shaft operation and on the ground surface. The feature of this study is using both specification documents and mathematical modeling, with regard to geology, structure and lithology of a deposit and rock mass, physical and mechanical properties and geometrical complexity of mine objects, which essentially improves studies into stability of underground openings and ground surface. It is found that the basic measure of safety I mining of the protective pillar of shaft RESH is establishing safety pillars.

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Selection of accessing and development schemes for extracting reserves of ore body 2 in Irtysh deposit

Krupnik¹,

Shaposhnik²,

Shaposhnik³

et al. 2018

Min. miner. depos.

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Purpose. Justification and selection of a rational scheme for accessing the second ore body of the Irtysh deposit based on a technical and economic comparison of its adopted competitive options.Methods. The main mining, geological and engineering requirements for selecting the scheme for accessing the Irtysh field are considered to achieve the goal. Three competitive accessing options are proposed on the basis of project regulatory documents and geotechnological features of the ore body. The optimal scheme of accessing was suggested taking into account the volumes of mining and preparatory works and averaging of the metal content in the ore by the method of technical and economic comparison.Findings. Analysis of the accessing schemes was performed for deposits similar in the geological conditions and represented by fragmented ore bodies. The advantages and disadvantages of 3 competitive access options are reviewed in detail. The technological and economic feasibility of excavation of ore body 2 reserves has been substantiated, i.e. of accessing them by fringedrifts between the Irtysh and Vspomogatel'naya mines on the upper horizons of the deposit. It is established that the difference in the volume of capital works (CW) and preparatory works (PW) is 45640 m 3 in favor of accessing ore body 2 by fringedrifts between the Irtysh and Vspomogatel'naya mines. At the same time, the volumes of CW and PW at the initial and final stages of development are much lower than in the case of accessing by a transport ramp from the surface. The change in the average content of copper, lead and zinc with the simultaneous development of the Osnovnaya Deposit and the South-Eastern Deposit in the lower horizons of the field has been calculated.Originality. For the conditions of ore body 2 of the Irtysh deposit, planned for development in accordance with the proposed access, it was found that despite the decrease in the copper content in the saleable ore, the lead content in the saleable ore will increase to 0.49% and zinc content, respectively, to 3.83%. Practical implications. Mining of ore body 2 according to the recommended accessing scheme with a minimum amount of mining will allow to raise the productivity of the Irtysh mine to 600 thousand tons per year during the period 2018 -2026, as well as to increase the extraction of lead and zinc.

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Geomechanical assessment and substantiation of mining conditions and mining method for Irtysh deposit

Cited by 3 publications

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Rock mass management to ensure safe deposit development based on comprehensive research within the framework of the geomechanical model development

Rock mass management to ensure safe deposit development based on comprehensive research within the framework of the geomechanical model development

Stress–strain analysis of rock mass during mining of protective pillar of vertical shaft

Selection of accessing and development schemes for extracting reserves of ore body 2 in Irtysh deposit

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