scholarly journals ASSESSMENT OF CHANGES IN THE HYDROGEOLOGICAL CONDITIONS CAUSED BY WET-BASED CONSERVATION OF THE STYLSKYI QUARRY OPERATED BY “DOKUCHAEVSK FLUX AND DOLOMITE COMPLEX” PJSC USING MATHEMATICAL MODELLING

2021 ◽  
pp. 17-34
Author(s):  
Yu.F. Rudenko ◽  
V.M. Shestopalov ◽  
Iu.A. Negoda ◽  
O.V. Gural
Keyword(s):  
Mathematical Modelling ◽  
Water Intake ◽  
Raw Materials ◽  
Research Area ◽  
Coal Industry ◽  
Hydrogeological Model ◽  
Mining Operations ◽  
Hydrogeological Parameters ◽  
Hydrogeological Conditions ◽  
Water Outflow

Extraction of minerals significantly affects the hydrogeological conditions of the environment. Active development of mining operations in the Donbas region determined the dominant influence of technogenic changes in geological environment on the formation of modern ecological conditions in the region. This applies not only to coal mining but also raw materials extraction (dolomites, limestone) for metallurgical plants mostly by quarrying. Recently, a significant environmental problem in the region has been the mines and quarries closure, envisaged by the program for restructuring the coal industry of Ukraine. Closure of mines or quarries through wet-based conservation is the least financially expensive, although it significantly increases the technogenic load on the natural environment. The object of research involved groundwater and surface water within the area of the Stylskyi and Skhidnyi (Vostochnyi) quarries of the “Dokuchaevsk flux-dolomite complex” PJSC, as well as Kipucha Krynytsa and Shevchenkivskyi water intake structures. The goal of research was to forecast changes in the hydrogeological conditions under the influence of wet-based conservation of the Stylskyi quarry. To achieve this goal, hydrogeological methods, mathematical modelling, and expert assessments were used. Consequently, a hydrogeological model of the research area was created, its functional correspondence to the natural-anthropogenic conditions was confirmed, and calculation hydrogeological parameters were specified. As a result, the forecast of changes in the hydrogeological conditions under the influence of wet-based conservation of the Stylskyi quarry was made. In particular, the following issues were determined: the dynamics of quarry flooding; the influence of this process on changes in water inflows to the Skhidnyi (Vostochnyi) quarry, Kipucha Krynytsa and Shevchenkivskyi water intake structures; possible flooding of settlements and swamping of the research area; changes in chemical composition and groundwater salinity; time of quarry draining at various intensity of water outflow to resume mineral production in case of need. We would like to emphasize that the forecasts made should be used when designing partial or full flooding of the Stylskyi quarry.

scholarly journals Assessment and Calculation of Groundwater Reserves for Drinking Water Supply in Mountainous Areas of the Chechen Republic

2019 ◽  
Author(s):  
Sh Sh Zaurbekov ◽  
L I Ozdoyeva ◽  
A A Shaipov ◽  
V A Gridin ◽  
R Z Dzharnagaliyev ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Water Intake ◽  
Drinking Water Supply ◽  
Fresh Groundwater ◽  
Mountainous Regions ◽  
Hydrogeological Parameters ◽  
Hydrogeological Conditions ◽  
Groundwater Reserves ◽  
River Valleys

This article is devoted to the urgent problem of drinking water supply in the mountainous regions of the Chechen Republic. The results of the assessment and calculation of groundwater reserves are presented. The article gives a brief assessment of the hydrogeological conditions of the study area, especially the complex of alluvial lower-upper Pleistocene sediments of the overdeepened river valleys, represented by boulder-pebble and boulder-rubbly formations with sand and sand-loamy aggregates. For inventory assessment and choice of a methodology of the reserves calculation in the Research Methods section, the hydrogeological conditions for the formation of groundwater are schematized in all the four study areas (Khimoyskiy, Shatoyskiy, Itum-Kalinskiy, Vedenskiy). On the basis of experimental field hydrogeological works, the calculation hydrogeological parameters necessary for the calculation of the groundwater reserves are determined (the main hydrogeological parameters on the estimated areas are given in the article, in the table 1). In the Methods section, the detailed justification of the scheme of placement of project wells is given (further the wells are supposed to be used as a water intake). For all the four areas – Khimoyskiy, Shatoyskiy, Itum-Kalinskiy and Vedenskiy the “strip aquifer” scheme is adopted as the calculation, limited by two parallel impermeable contours (the slopes of river valleys are composed of impermeable water-resistant bedrocks). In the Results section, all schemes, formulas and brief characteristics of each investigated area (the acreage, the necessary water demand, the type of project water intake) are given. For each area, an security assessment of the calculated reserves is given, which is confirmed by the balance method (all the calculations are given in the article). In conclusion of the article in table 03 the data on the reserves of fresh groundwater based on the results of prospecting-evaluation works of 01.06.2015 are given.

Conceptual model for minimizing the risk of water pollution in the Kemerovo region

2020 ◽  
pp. 107-118 ◽  
Author(s):  
E. Yu. Kulikova ◽  
Ju. A. Sergeeva
Keyword(s):  
Water Pollution ◽  
Conceptual Model ◽  
Water Contamination ◽  
Coal Industry ◽  
Water Bodies ◽  
Polluted Water ◽  
Mining Operations ◽  
Mine Waters ◽  
Critical Limit

One of the problems of functioning of coal industry enterprises is the formation of mine waters, which are discharged into water bodies and cause their dangerous pollution. The total volume of water pumped by the enterprise includes up to 15 % for the recycling cycle, the remaining 85% is discharged to surface water bodies. As a result, the ecological balance of coal regions is disturbed, their sanitary and hygienic state on the environment worsens, and the quality of coal is reduced due to the intake of polluted water for technological operations. The volume of mine water contamination increases during mining operations at deeper horizons and in difficult mining and hydrogeological conditions. In turn, this leads to pollution and depletion of underground aquifers and the formation of environmental risk factors. In Kuzbass, all these factors contribute to the development of water crisis, since the state of surface reservoirs has already reached a critical limit. Especially dangerous is the process of liquidation of mines. Closing mines and sections disrupt natural water flows, resulting in all water from the aquifers going to deeper horizons. More pollutants enter the water, which poison the underground hydrosphere of the regions. The paper analyzes the pollutants entering the underground and surface hydro grid at coal-fired plants and offers a Conceptual model for minimizing the risk of water pollution.

Mathematical modelling of the selective intake process from the interior volume in a three-layer stratified reservoir

2020 ◽  
Author(s):  
И.Д. Музаев ◽  
К.С. Харебов ◽  
Н.И. Музаев
Keyword(s):  
Boundary Value Problem ◽  
Mathematical Modelling ◽  
Water Intake ◽  
Flow Rate ◽  
Intermediate Layer ◽  
Intake Process ◽  
Intake Pipe ◽  
Stratified Reservoir ◽  
Selective Intake ◽  
Interior Volume

Проведено механико-математическое моделирование селективного водозаборного процесса в трехслойном стратифицированном водоеме, когда вода забирается из внутреннего объема промежуточного слоя водоема. Составленная математическая модель представляет контактную начально-краевую задачу теории поверхностных и внутренних гравитационных волн в идеальной несжимаемой жидкости. Водозабор из внутреннего пространства промежуточного слоя смоделирован в виде объемного стока с бесконечно малой толщиной и конечным сточным расходом. В результате решения поставленной начально-краевой задачи получена система расчетных формул, которая с привлечением компьютерных средств позволяет выбирать диаметр водозаборной трубы и расход через нее, вычислять отметку глу- бинного расположения конца водозаборной трубы. Выбор этих параметров обеспе- чивает селективный водозабор исключительно из промежуточного слоя, где вода чище и холоднее, чем в других слоях водоема. The purpose of this work is to carry out mathematical modelling of selective water intake process in a three-layer stratified reservoir, when the water is taken from the interior volume of the intermediate layer of the reservoir. In the methodology for solving the problem, the water intake from the interior volume of the intermediate layer is modelled as a finite flow rate drain of fluid trough an infinitely thin layer. The contact initial-boundary value problem of the theory of surface and internal gravitational waves in an ideal incompressible fluid is used as a mathematical model of the water intake process. As a result we obtain a system of calculation formulas for estimation of the diameter of water intake pipe and the flow rate through it. The depth mark of the end of the water intake pipe was calculated. Originality/value: 1. The boundary value problem simulating a selective water intake process from the internal volume of the intermediate layer of a three-layer stratified reservoir was formulated and solved. 2. On the basis of the obtained set of formulas, computer experiments were performed and thus the regularities of the influence of the above external input parameters on the process were established. 3. The choice of these parameters provides selective intake exclusively from the intermediate layer, where the water is cleaner than in the lower layer and colder in summer than in the upper layer.

scholarly journals Analysis of the data of hydrogeochemical monitoring of groundwater in the North Sivash artesian basin

2019 ◽  
pp. 64-71
Author(s):  
K. Ya. Bulakhova ◽  
S. M. Sudarikov
Keyword(s):  
Research Area ◽  
Geological Structure ◽  
Hydrogeological Model ◽  
Artesian Basin ◽  
Correlation And Regression Analysis ◽  
The North ◽  
Gypsum Content ◽  
Definition Of ◽  
Aquifer Complex ◽  
Made In

The results of hydrogeochemical monitoring of the Sarmat-Meotis-Pontic sediments aquifer complex of the North Sivash artesian basin have been analyzed. The analysis based on a routine observations for 16 producing wells. The observations were made in the period from 2014 to 2017 years. A correlation and regression analysis has been made for definition of dependencies between changes in the concentrations of the normalized components. The results obtained allow us to evaluate the main factors of formation of the chemical composition of groundwater. At the present stage, metamorphosed waters are pulled up from the lower strata of the complex, that leads to an increase in the amount of mineralization. The formation of sulphate waters is primarily associated with the peculiarities of the geological structure, namely, the high gypsum content of quaternary deposits and the presence of hydraulic connection with the overlying aquifers. One of the reasons for the formation of sulphate waters is the anthropogenic impact associated with the close location of the acid accumulator containing sulfur tailing. The results obtained allow us to proceed to the next stage of the survey — the creation of a natural hydrogeological model of the research area and the carrying of the thermodynamic modeling.

scholarly journals Hydrogeological foundations of the usage of depleted pits areas

2018 ◽  
pp. 75-77
Author(s):  
M. M. Tscherepansky ◽  
A. B. Obukhova
Keyword(s):  
Computational Models ◽  
Research Area ◽  
Water Protection ◽  
Economic Activities ◽  
Protection Measures ◽  
Hydrogeological Conditions ◽  
Determining Factors ◽  
People Development ◽  
Reasonable Choice ◽  
Surface And Groundwater

The problem of choosing the type of activity, methods and technologies of reclamation of quarry spaces, in the conditions of minimizing the harmful impact on water resources, is determined by a large number of natural and man-made factors. One of the main and determining factors is the state of surface and groundwater, as well as their change in the reclamation of quarries. To solve this problem, it is proposed to create an information and expert system (IES) for selecting a method of reclamation of quarries of IES «Quarry-water-reclamation», based on the natural and man-made conditions of the territories. The purpose of the development of IES «Quarry-water-recultivation» is a reasonable choice of methods, options and technologies for recultivation of the quarry space, based on the physical, geographical, geological, hydrological and hydrogeological conditions of the research area, the method of mining, the conditions of use of surface and groundwater, on the basis of these monitoring systems, as a result of retrospective and predictive geofiltration modeling, taking into account the planned for the implementation of design and water protection solutions and measures, as well as the social - economic conditions of the region. Tasks for the collection and compilation of physicogeographical, geological, hydrological and hydrogeological conditions according to the basin principle, the characteristics of economic activities, the construction of geofiltration, hydrodynamic and computational models, with the further correction of the last solution of the series of predictive tasks, the change of the hydrological and hydrogeological conditions of the area as a result of various variants of recultivation of the quarry, analysis of the current legislation, the requirements of the local authority and wishes of the local people, development of the project of water protection measures of the selected option.

Improving Safety when Extracting Water-soluble Ores by Optimizing the Parameters of the Backfill Mass

2021 ◽  
pp. 53-59
Author(s):  
M.M. Khayrutdinov ◽  
◽  
Ch.B. Kongar-Syuryun ◽  
A.M. Khayrutdinov ◽  
Yu.S. Tyulyaeva ◽  
...  
Keyword(s):  
Strain State ◽  
Raw Materials ◽  
Research Work ◽  
Integrated Approach ◽  
Water Soluble ◽  
Mining Operations ◽  
Stress Strain ◽  
Mining System ◽  
Stress Strain State ◽  
Geological Conditions

The results of the scientific and research work devoted to modeling the stress-strain state of the mining system of an underground mine using the finite element method in the FLAC3D software are presented in the article. The possibility of using room-and-pillar mining with backfill with the abandonment of chain pillars is justified. The results are presented concerning the research results of the quantitative assessment of the mass using the von Mises equation and Norton' power law of creep to estimate the contour stress. It becomes possible to determine the sequence of mining of the deposit area and the stage-by-stage filling of the stopes at the stage of mining design due to the high accuracy of modeling the stress-strain state of the mass near mining operations using FLAC3D software. The proposed approach is possible when evaluating the geotechnical state of the rock mass when using the mining systems with various methods of support of the mined-out area: natural; artificial; with the collapse of ores and enclosing rocks, as well as when calculating the combined method of deposit development. A differentiated approach to assessing the state of the mass is possible considering difficult mining and geological conditions, conditions of increased rock pressure, abundant water influx, increased fracturing of rocks by introducing additional conditions into the model depending on its geotechnical state. Variant of the comprehensive exploitation of mineral resources was proposed considering the total value of natural and man-made geo-resources of the area being mined. The possibility of rational use of the mined-out space with the use of various positive qualities of geo-resources at their manmade transformation is also considered. An assessment of the mineral and raw materials potential of the mined area is given with a proposal for the prospects of increasing the integrated approach of excavation, increasing the life of the mining enterprise and the complexity of developing this area.

The availability of coal

1987 ◽  
Vol 92 (1-2) ◽  
pp. 21-28
Author(s):  
K. Moses
Keyword(s):  
Great Britain ◽  
Nuclear Power ◽  
Energy Content ◽  
Low Cost ◽  
New Ventures ◽  
Coal Industry ◽  
Royal Commission ◽  
Mining Operations ◽  
Coal Reserves ◽  
The Cost

SynopsisSince the assessment of coal reserves for the Royal Commission on the coal industry of Great Britain made nearly a century ago, up to assessments made by geologists of the National Coal Board, it has been evident that the coalfields of Scotland contain considerable quantities of coal. Throughout the past two decades the presence of hydrocarbons in the rocks beneath the North Sea, the general abundance of oil in various parts of the world, and the development of nuclear power, has meant that coal is only one of several sources of energy readily available to us. The coalfields of Scotland contain seams of varying quality and energy content and so can be compared with other fuels. Consequently it is the cost of the energy to the consumer that is often the controlling factor in the choice of which fuel to use. The very nature of coal as a bulky and not-too-easily-handled fuel has meant that only the generation of electricity offers the scope for substantial consumption of coal.The paper examines these factors and also the location of the coal reserves in Scotland, particularly in the light of the geological factors that affect the cost of the energy. The National Coal Board's deep mining exploration programme in Great Britain has sought opportunities for new ventures and developments, some of which have been in Scotland. The market for the coal and the competition for that market clearly indicates that the productivity of coal mining operations is paramount in determining the future size of the coal industry in Scotland. About half of the coal can be provided from low-cost opencast operations, with the other half obtained from the mines with the highest productivities—productivities that result in energy costs similar to those obtained from oil and nuclear power.

scholarly journals The Analysis of Conditions of Hydraulic Backhoes Use in the Coal-Bearing Zones at Kuzbass Open Pits

2018 ◽  
Vol 41 ◽  
pp. 01027
Author(s):  
Andrew Strelnikov ◽  
Michal Radek ◽  
Markus Stolz ◽  
Ralf Rosenberg
Keyword(s):  
Sharp Increase ◽  
Western Siberia ◽  
Coal Industry ◽  
Open Pit ◽  
Open Pit Mining ◽  
Mining Operations ◽  
Market Relations

The period of open pit mining development in Kuzbass (Western Siberia, Russia) until the mid-1990s was characterized by the application of rope and hydraulic shovels in coal-bearing zones, the work of which is not effective enough due to a decrease in productivity in mining operations, high losses and dilution of coal. The supply of this type of excavators was fully provided by Russian excavators' manufacturers. With the transition to market relations since the early 90's, in the coal industry of the Kuzbass two interrelated phenomena have occurred. First, the restructuring of coal industry and the massive privatization of licensed development of explored deposits forced a sharp increase in the open pit construction (from 24 in the early 1990's to 62 now). Secondly, the bankruptcy of excavators' manufacturers led to a reduction in the volume of production of domestic rope shovels. So the problem of defining the conditions of hydraulic backhoes use in the coal-bearing zones became very important.

Study on the properties of coal-based high-purity graphite

2019 ◽  
Vol 9 (6) ◽  
pp. 668-674 ◽  
Author(s):  
Qili Wang ◽  
Mingquan Yu ◽  
Jiannan Gong ◽  
Fengtao Zhang
Keyword(s):  
High Purity ◽  
Raw Materials ◽  
Coal Tar ◽  
Value Added ◽  
Coal Industry ◽  
Coal Pitch ◽  
Skeletal Density ◽  
Pitch Coke ◽  
Chinese Coal ◽  
Value Added Products

As one of the major value-added products of coal processing and utilization, coal pitch coke and coal tar pitch are used as raw materials to prepare high-purity graphite. The structure characteristics and properties were measured by experiments. The results show that the high-purity graphite has excellent physical properties: the skeletal density of 1.81–1.91 g/cm3, the Shore hardness of 45.5–66.6 Hs, the flexural strength of 33.0–46.1 MPa, the compressive strength of 65.6–75.8 MPa, the ash content of 67–181 ppm, the thermal expansion coefficient of 3.71–4.11 × 10–6/°C, and the electrical resistivity of 8.72–12.13 μΩ · m. Consequently, coal-based graphite materials have excellent properties and good application prospects in solar energy industry, which is an effective exploration for the transformation and upgrading of Chinese coal industry.

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