Mathematical model to optimize drilling-and-blasting operations in the process of open-pit hard rock mining

Shcherbakov, Petro; Tymchenko, Svitlana; Bitimbayev, M. Zh.; Sarybayev, Nurzhigit; Moldabayev, Serik

doi:10.33271/mining15.02.025

Cited by 13 publications

(14 citation statements)

References 12 publications

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“…Moreover, it is critically important for the environmental and ecological sustainability of mineral resources mining [6]- [8]. The main objective of new technological solutions should be in the provision of sustainable development of a mining region both in terms of ecology and economy by involving greater volumes of the associate raw materials being today the mineral industry wastes [9]- [12]. However, in case of building industry those wastes can be a source of material production.…”

Section: Statement Of the Problemmentioning

confidence: 99%

Methodological principles of the selection of a resource-saving technology while developing water-bearing placer deposits

Ложніков¹,

Шустов²,

Chebanov³

et al. 2022

Min. miner. depos.

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Purpose. The present paper aims to develop methodological principles for the selection of effective parameters of resource-saving technologies while developing water-bearing titanium-zirconium deposits basing on the complex of analytical studies. Methods. The paper applies a complex of research methods: analytical – to analyze and generalize the main differences of the development technology for water-bearing placer deposits and problem statement; technical-economic analysis for identifying the effect of a resource-saving technology on the indices of land use of the open-pit mining and involvement of associate raw materials in the economic activity; forecasting – to determine the influence on complex development of a titanium-zirconium deposit on the operating parameters of the regional nonmetallic raw material open pits. Findings. Effective trends in using the associate raw materials located in the enclosing and overburden rocks of a titanium-zirconium deposit are identified. Key differences between the technologies of associate raw material mining from the overburden rocks and their recovery from the enclosing rocks while mineral mining are defined. Predictive influence of a resource-saving technology of the development of titanium-zirconium deposits on the extraction of building materials from the regional nonmetallic open pits is specified. Volumes of possible associate raw material mining while developing the Motronivskyi GZK open pit during its operation are determined. Originality. New dependences of a land capacity coefficient while mining nonmetallic raw material in the region, prime cost of ore development as well as number of open pits for sand and clay production in the region on the volumes of involved associate raw material of the titanium-zirconium open pits are identified. Practical implications. A structural-logical scheme is elaborated for the selection of a resource-saving technology while operating open pits for the development of titanium-zirconium deposits.

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Section: Statement Of the Problemmentioning

confidence: 99%

Methodological principles of the selection of a resource-saving technology while developing water-bearing placer deposits

Ложніков¹,

Шустов²,

Chebanov³

et al. 2022

Min. miner. depos.

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“…Respectively, GSI = 25 according to (5). By Rocklab pro gram data, incorporated in PHASE 2 code, for GSI = 25 the parameters of criterion ( 1) take values: m b = 0.033; s = = 0.0000037; α = 0.5313.…”

Section: Fig 4 Potential Distribution Of Maximum Shear Strains At The...mentioning

confidence: 99%

“…Therefore, steeper angles of the quarry sides are designed, which increas es the risk of the slope instability and the development of slid ing processes. Numerous cases of slope failure that occurred in quarries around the world require the development of a hazard assessment system based on monitoring the sides of ore quar ries [2][3][4], as well as mathematical models for the risk evaluat ing [4,5]. The slope stability estimation is mainly carried out through a combined analysis by the methods of limit equilib rium [6,7] and numerical simulation [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Mathematical modeling the quarry wall stability under conditions of heavily jointed rocks

Aitkazinova¹,

Sdvyzhkova²,

Imansakipova³

et al. 2022

Nauk. visn. nat. hirn. univ.

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Purpose. To develop techniques for estimating the pit wall stability in terms of occurring of a zone of heavily jointed rock mass during ore mining at the Akzhal deposit (Kazakhstan), to work out measures to strengthen the rock opening and to verify the effectiveness of the developed measures. Methodology. The finite element analysis of the rock stress-strain state is implemented on the basis of the elastic-plastic model and the generalized Hoek-Brown failure criterion. The rock mass quality was assessed using the RMR and GSI rating classifications. This made it possible to simulate a zone of intense fracturing by changing the characteristics of the jointed surface. The shear strength reduction procedure was used to determine the safety factor for the quarry wall. Findings. The strain distributions in the rock mass forming the quarry wall have been obtained in terms of the Akzhal polymetallic ore deposit (Kazakhstan). The case of creating a zone of heavily jointed rocks in the area of a tectonic fault was considered. The safety factor of the quarry wall was determined under conditions of increased rock fracturing, as well as after carrying out measures to strengthen the rocks with a hardening solution. Originality. The effect of intense jointness on the pit wall stability is demonstrated. A method for the consistent evaluation of the quarry wall stability is proposed considering the change in the rock properties due to natural factors and artificial reinforcement. It is shown that a change in the joint surface quality due to the hardening injection reduces the shear strains in the sliding zone. Practical value. The pit wall stability was predicted considering the formation of a zone of intense fracturing under mining and geological conditions of the Akzhal deposit. The possibility of testing the effectiveness of rock strengthening measures based on mathematical modeling was shown.

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“…That is stipulated by the considerable heterogeneity of rocks occurring in the real rock mass, though it is not manifested during the sample testing. The mentioned dissimilarity may be considered by introducing the structural coeffi cient determined on the basis of a probabilistically statistic approach [19] .…”

Section: Shear Strength F Shear Force mentioning

confidence: 99%

Numerical simulation of the open pit stability based on probabilistic approach

Moldabayev¹,

Sdvyzhkova²,

Babets³

et al. 2021

Nauk. visn. nat. hirn. univ.

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Purpose. To identify development regularities related to a stress-strain state and stability of the open pit walls while mining the steeply inclined iron-ore body at various stages of mining considering deterministic and stochastic components of the rock mass structural heterogeneity. Methodology. Numerical 3D simulation of the rock stress-strain state; application of the strength reduction procedure to determine a safety factor, taking into account the rock mass heterogeneity based on a stochastic model. Findings. The distribution of maximum shear deformations and displacements within the rock mass, making up the pit wall, has been obtained. Potential slide surfaces and safety factors have been determined at various stages of the inclined ore body mining. The effect of the rock mass structure on the pit wall stability has been estimated. A comparison of calculations based on the 3D and 2D models has been carried out. The correction coefficient has been obtained, which allows using the 2D model for multivariate calculations. The relationship of safety factor versus the overall slope angle has been developed. Originality. It has been proved that pit walls retain their stability (the stability factor (SF) is not less than 1.27) while mining the steeply inclined ore body with the transverse panels from top to bottom within each newly cut layer, despite the increasing depth of mining. It is shown that modeling of the real geological structure of a three-dimensional rock mass area factors into the decrease in (by 7%) the safety factor in comparison with the results of the homogeneous model. A probabilistic-statistical approach has been proposed to consider the heterogeneity of the rock mass and avoid unreasonably optimistic forecasts of the pit wall stability. It is shown that 3D modeling gives SF, which differs by 8% from the values obtained in the 2D model. This allows substantiating the correction coefficient to improve the 2D modeling results. Practical value. The regularity of changes in the pit wall stability has been determined depending on the overall pit slope angle in terms of mining-geological and mining-technical conditions of the Kachar deposit, taking into account the real rock heterogeneity.

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Mathematical model to optimize drilling-and-blasting operations in the process of open-pit hard rock mining

Cited by 13 publications

References 12 publications

Methodological principles of the selection of a resource-saving technology while developing water-bearing placer deposits

Methodological principles of the selection of a resource-saving technology while developing water-bearing placer deposits

Mathematical modeling the quarry wall stability under conditions of heavily jointed rocks

Numerical simulation of the open pit stability based on probabilistic approach

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