Development of resource-saving technology when mining ore bodies by blocks under rock pressure

Pysmenniy, Serhii; Shvager, Natalya; Shepel, Oleksandr; Kostiantyn, Kovbyk; Dolgikh, Oleksandr

doi:10.1051/e3sconf/202016602006

Cited by 28 publications

(25 citation statements)

References 22 publications

(31 reference statements)

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“…Historically, application of self-propelled load-haul machines started with their introduction at foreign mines in the middle of the XX century [11][12][13][14].…”

Section: Resultsmentioning

confidence: 99%

Technological measures to enhance efficiency of mining ore from stopes applying self-propelled equipment

Stupnik

Kalinichenko

et al. 2021

E3S Web Conf.

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The work analyzes current technologies of ore mining applying self-propelled equipment in underground conditions; studies practices of using the equipment in general and for broken ore transportation only; considers performance of mining enterprises in similar mining-geological and miningtechnical conditions; analyzes and generalizes causes of high ore loss and dilution rates in underground mining in Kryvyi Rih iron ore basin, thus revealing a problem of providing high efficiency and increased ore extraction with minimal quality deterioration. Marketable ore production is affected by decreased quality and high broken ore losses. Incomplete balance ore extraction when breaking and drawing ore from the stope results in deterioration of mining indices. Ore dilution with waste rocks leads to decreased ore content in the mined mass as compared with that in the ore massif. The research enables development and substantiation of the rational technology of ore drawing and transportation as well as designing a new structure of the loading face to ensure increase of the drawn ore quality indices.

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“…Historically, application of self-propelled load-haul machines started with their introduction at foreign mines in the middle of the XX century [11][12][13][14].…”

Section: Resultsmentioning

confidence: 99%

Technological measures to enhance efficiency of mining ore from stopes applying self-propelled equipment

Stupnik

Kalinichenko

et al. 2021

E3S Web Conf.

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“…Particular attention during conventional mining is paid to the management of stress and pressure in mining to ensure the manufacturability of this process [16]. Reliability of technological innovation systems [17] that lead to safety potential of engineering enterprises [18], resource management [19]- [21] and creation of a green economy in mining [22], must be also taken into account.…”

Section: Introductionmentioning

confidence: 99%

Management of the longwall face advance on the stress-strain state of rock mass

Shavarskyi¹,

Falshtynskyi²,

Dychkovskyi³

et al. 2022

Min. miner. depos.

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Purpose is to study influence of a longwall face advance on the geomechanical situation in the neighbourhood of a mining site based upon determination of changes in standard and critical subsidence of the immediate roof rocks. Methods. To study a geomechanical situation in the neighbourhood of a mining site the authors have applied software product GeoDenamics Lite developed at Dnipro University of Technology. The software product relies upon a calculation procedure of stress-strain state of rocks by Professor O.V. Savostianov. Expediency of the software selection is based upon the supported control and adaptation of a coal mining technique to changes in geodynamic stress fields in the anisotropic rock-coal medium impacting temporal and spatial changes in the technological parameters. Findings. The basic problems have been singled out connected with certain changes in a longwall face advance. For the first time, an analytical scheme of tangential stresses within the immediate roof rocks has been developed for Lisova mine of SE Lvivvuhillia under the conditions of coal seam mining by means of the paired longwalls which makes it possible to determine both physical and geometrical parameters of standard loads within the formation. Originality. Dependencies of temporal and spatial changes in subsidences and horizontal displacements of rock layers of the immediate roof have been defined being 5.2 m for the upper rock pack and 3.9 m for the lower pack if the longwall longwall face advance is 1.9 up to 4.8 m/day. Both physical and geometrical parameters of the reference pressure have been defined as well as the parameters of lower sandstone pack in the process of the main roof subsidence. Impact of the extra pressure forces on the immediate roof rocks has been analyzed at the moment of critical lowerings of the immediate roof rocks. In this context, standard loading from the overlying formation in addition to tangential stresses in the roof result in rock failure due to vertical cracks above a longwall face. Practical implications. The engineering methods have been developed making it possible to identify impact parameters of a longwall face advance on the geomechanical situation in the neighbourhood of a mining site. In future, it will help forecast changes in the reference pressure around a longwall face while preventing emergency settlement of the powered support.

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“…In the Kryvyi Rih Iron-ore Basin, iron ore is mined by a system of sublevel blast-hole stoping and sublevel caving mining method at an average uniaxial compression strength of 120-140 MPa of the hanging wall and foot wall rocks. In this case, the main reason for the ore dilution is the deviation in the blast-holes direction and their exit into the space beyond the contour, which leads to the waste rocks destruction beyond the extraction contour of the ore body, followed by dilution of the ore mass with them and a decrease in the Fe content to 12% [39,40].…”

Section: Introductionmentioning

confidence: 99%

Instability Assessment of Hanging Wall Rocks during Underground Mining of Iron Ores

et al. 2021

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The paper presents the study of the deformation processes development in unstable rocks of the hanging wall during mining a thick steeply dipping ore deposit in the example of the Yuzhno-Belozerskyi deposit. In the studied field, there are problems of stability of hanging wall rocks, represented by low-resistant shale rocks that do not withstand significant outcrops in time. A decrease in stability is manifested in the form of failure of the hanging wall rocks into the stope. Based on a detailed study of the ore deposit geological structure and the performance of the stopes mining, according to the survey data, an area of the deposit has been identified where the ore failure and dilution reach 4%–8% with a maximum value of 12%. This also makes it possible to determine the most important averaged source data for performing physical modeling on equivalent materials. It has been determined that the deformation value of the hanging wall rocks with subsequent failure into the stope and ore mass deformation in the sloping bottom change exponentially with an increase in the depth of the stope location, and the dynamics of increasing rock deformations in the hanging wall is noticeably higher than in the sloping bottom of the stope. This reduces the quality of the mined ore and increases the probability of rock failure area propagation to the hanging wall drifts with their subsequent destruction. The results of physical modeling are characterised by acceptable reliability and are confirmed by a high similarity with the actual data on ore dilution with broken rocks during the stopes development. It has been found that during the formation of a steeply dipping outcrop of stopes with an area of 1200 m2, unstable rocks of the hanging wall are prone to failure of significant volumes. For successful mining and achieving stope element stability, it is recommended to optimise its parameters, the height, width and the value of a steeply dipping outcrop, as well as to preserve the ore pillar in the hanging wall until the ore is broken and drawn from the rest of the stope.

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Development of resource-saving technology when mining ore bodies by blocks under rock pressure

Cited by 28 publications

References 22 publications

Technological measures to enhance efficiency of mining ore from stopes applying self-propelled equipment

Technological measures to enhance efficiency of mining ore from stopes applying self-propelled equipment

Management of the longwall face advance on the stress-strain state of rock mass

Instability Assessment of Hanging Wall Rocks during Underground Mining of Iron Ores

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