Digital survey in studying open pit wall deformations

Kalinichenko, Vsevolod; Dolgikh, Oleksandr; Dolgikh, Liubov

doi:10.1051/e3sconf/201912301047

Cited by 13 publications

(11 citation statements)

References 15 publications

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“…where σ max is maximum stresses of internal forces in the massif, t/m 2 ; τ is maximum shearing stresses occurring in the massif, t/m 2 ; [σ] is ultimate strength of the material, t/m 2 . It is known that when calculating the pillars stability, the main criterion is bending [66,67]. However, in the rocks of massif when exceeding the maximum stresses, the zones of fractures are formed, which lead to a decrease in the ultimate strength of the pillar composed by rocks, and eventually to its destruction.…”

Section: Resultsmentioning

confidence: 99%

Mining of rich iron ore deposits of complex structure under the conditions of rock pressure development

et al. 2020

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The purpose of research is to increase the ore mass extraction ratio when mining rich iron ores by changing the shape of the stope chamber, as well as to substantiate its stable parameters under the conditions of the rock pressure manifestation. Used in mines existing methodologies for determining the structural elements of mining system are based on calculated equivalent spans of outcropping the stope chambers, which have a rectangular or tent shape. For the first time using the ANSYS software package, it has been determined that the formation of a compensation chamber of quasi-parabolic shape can significantly reduce the stresses concentration around the stope block. Thus, the formation of a stope chamber of a quasi-parabolic shape makes it possible to reduce vertical stresses as compared to horizontal ones without increasing horizontal pressure. When mining the extraction block, it is proposed to form the stope chamber of a quasi-parabolic shape with geometric parameters that directly depend on the parameters of the deposit, the depth of mining, and the direction of main stresses action. Dependences have been determined of the stresses value on the depth of mining and the physical properties of rocks, as well as on the length along the strike of the ore deposit. Thus, depending on the mining depth and length along the strike, rock pressure on the stope chamber of a quasi-parabolic shape decreases under non-uniform loading. The formation of a stope chamber of a quasi-parabolic shape will increase by 1.2 – 1.5 times the volume of pure ore that is recovered from the block.

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Section: Resultsmentioning

confidence: 99%

Mining of rich iron ore deposits of complex structure under the conditions of rock pressure development

et al. 2020

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“…Most of underground mines prefer stoping with pillar caving. Yet, in complicated mining and geological conditions rock pressure contributes to growth of workings maintenance costs and deterioration of extraction indices [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the technology of mining steep ore bodies applying the “floating” crown

et al. 2021

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When mining ore bodies in Kryvyi Rih iron ore basin, underground mines apply open stoping or bulk caving systems in proportion of 55% to 45%. Most of underground mines prefer stoping with pillar caving. Yet, rock pressure contributes to growth of costs for workings maintenance and deterioration of extraction indices. Rock mass extraction indices can be enhanced by application of a protectve structure in the upper part of the block that will enable additional decrease in load on the draw level. There are a great many of methods for determining parameters of constructive elements of the protective structure that help keep its integrity for the whole period of block mining. The article suggests methods for determining parameters of the protective structure when mining steep ore bodies. The research conducted demonstrates that with the inclined protective structure, increase of unit load on it from 200 to 1200t/m2 leads to decrease of its thickness from 6.3-20.9m to 5.5-18.4m and increase of the crown length from 40m to 60m. The developed block caving system with application of the protective structure when mining steep ore bodies enables overall decrease of ore dilution in the block by 3%, increase of iron content in the mined ore by 1.3% without significant mining costs growth and decrease of loads on the workings of the receiving level.

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“…Digital survey methods make possible to solve a wide range of tasks from drawing up a mine surveying plan to determining the volume of mining operations, designing works, etc. These methods are especially effective when monitoring for the deformations of the earth's surface and objects located on it [1]- [4]. Small aircraft have been used for several years in photographic survey when mapping territories [5].…”

Section: Introductionmentioning

confidence: 99%

Choosing a camera for mine surveying of mining enterprise facilities using unmanned aerial vehicles

Kalinichenko¹,

Dolgikh²,

Dolgikh³

et al. 2020

Min. miner. depos.

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Choosing an effective method for performing the mine surveying of the objects at mining enterprise based on the implementation of practical and analytical work. Particular attention is focused on the use of modern technologies for performing field and cameral work, which, in turn, enable to determine the most effective tools and methods for per-forming survey work in open pits, dumps, in collapse zones, and the like. At the same time, one of the priorities when creating graphic material in the form of a mine surveying plan or other mining-graphic documentation is strict compliance with the requirements for the quality of the drawn up documents. Methods. Analysis of the experimental data obtained as a result of the survey work: the mine territory, where the earth's surface collapsed; open pit flank where displacement is observed; open pit area, where reclamation is conducted. The photographic survey from the ground and from the air is made with digital cameras with different specifications for matrices and lenses. When surveying from the ground, photography from a tripod is used, and when surveying from the air, the camera is carried by an unmanned aerial vehicle. Findings. The qualitative characteristics of the images have been obtained, created by different cameras in various photographic survey conditions. The dependence of the accuracy in determining the points coordinates from the digital images on the quality characteristics of the survey equipment has been obtained, which is used when photographing from the ground or installed on unmanned aerial vehicle. Originality. Patterns have been obtained between the accuracy of the data, measured from the research object images, and the metric characteristics of digital cameras and lenses that are used to obtain them. Practical implications. A method has been developed for performing highly efficient photographic surveys of open pits, dumps and other facilities of mining enterprises. Practical data have been obtained and analysed for the use of various types of cameras and lenses to them. The analysis of the measurement characteristics of the images makes it possible to conclude that further research in this direction is necessary in order to improve the existing methods for performing ground and air photography of open pits and other objects of mining enterprises.

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Digital survey in studying open pit wall deformations

Cited by 13 publications

References 15 publications

Mining of rich iron ore deposits of complex structure under the conditions of rock pressure development

Mining of rich iron ore deposits of complex structure under the conditions of rock pressure development

Enhancement of the technology of mining steep ore bodies applying the “floating” crown

Choosing a camera for mine surveying of mining enterprise facilities using unmanned aerial vehicles

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