Rubber hoses and hose assemblies for underground mining � Wire-reinforced hydraulic types for coal mining � Specification

2020 ◽  
Keyword(s):  
Coal Mining ◽  
Underground Mining

Modeling of the stress-state longwall face during coal mining with the technology of roof management complete drop and stowing

2020 ◽  
pp. 99-106
Author(s):  
I. E. Mazina ◽  
A. A. Stel’makhov ◽  
L. F. Mullagalieva
Keyword(s):  
Coal Mining ◽  
Strain State ◽  
Underground Mining ◽  
Negative Impact ◽  
Hydrological Regime ◽  
Coal Bed ◽  
Stress Strain ◽  
Environmental Friendliness ◽  
Modeling And Analysis ◽  
Stress Strain State

Underground mining of coal deposits has a negative impact on all components of the environment. When developing a coal deposit, it is coal mining technology that determines the scale and consequences of the negative impact. Changes in the stress-strain state of the geo-environment can lead to a violation of the hydrological regime, increased gas emission from the host rocks, the initiation of gas-dynamic processes. Choice of roofing management technology - as a geotechnological method of natural and technical system management determines the environmental friendliness of coal mining and creates safety conditions. The article deals with the technology of roofing control during coal production. For this purpose mathematical modeling and analysis of stress-strain state of the bottomhole part of the coal bed for the conditions of S.M. Kirov is performed. As a result of modeling, two technologies of roof control were analyzed - complete caving and stowing. For the worked out clearing leaves filled with either caving rocks or stowing material, there are characteristic unloading zones in the massif to be worked and overworked, as well as pressure reference zones, which fall on the parts of the pillars associated with the lava. It was found out that the application of the stowing technology creates conditions for minimization of gravitational stresses in the geoenvironment, as well as significantly reduces the potential energy of form change.

scholarly journals Effect of Underground Coal Mining on Slope Morphology and Soil Erosion

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Liu Ning ◽  
Zhao Xiao-Guang ◽  
Song Shi-Jie ◽  
Zhou Wen-Fu
Keyword(s):  
Soil Erosion ◽  
Surface Morphology ◽  
Coal Mining ◽  
Underground Mining ◽  
Slope Gradient ◽  
Underground Coal Mining ◽  
Slope Length ◽  
Natural Slope ◽  
Included Angle ◽  
Working Face

Underground coal mining will cause large-scale surrounding rock movement, resulting in surface subsidence and irreversible deformation of surface morphology, which would lead to geological disasters and ecological environment problems. In this paper, FLAC3D numerical model is built based on the natural slope gradient, slope type, and included angle between the slope and working face, and their influences on the change of surface morphology and soil erosion caused by underground coal mining is studied. Research results show that the change of slope gradient caused by underground mining decreases with the increase of natural slope gradient, while slope length has opposite laws; different slope types have different changes of slope morphology. The order of slope types corresponding to gradient changes is mixed slope < uniform slope < concave slope < convex slope; the length of the concave and uniform slope decreases, and the convex and mixed slope length increases. When the included angle between the slope and working face is 0° ≤ α < 90°, the underground mining will cause the natural slope gradient increase, the change of the slope gradient will increase with the rise of the angle, the slope length will decrease, and the rate of decrease will be reduced with the increase of the angle. Coal mining will cause the increasing of the runoff and erosion modulus of slope, mainly runoff modulus.

scholarly journals Ecological Risks in the Coal Mining in Tuva

2020 ◽  
Vol 17 (3) ◽  
pp. 16-29
Author(s):  
V. I. Zabelin ◽  
S. O. Ondar
Keyword(s):  
Coal Mining ◽  
Underground Mining ◽  
Noise Pollution ◽  
Ecological Risks ◽  
State University ◽  
Coal Basin ◽  
Treatment Facilities ◽  
Spontaneous Combustion Of Coal ◽  
Mandatory Use ◽  
Made In

The problems of ecological risks and technogenic hazards in the coal mining in Tuva based on the materials of geoecological research of the Tuva Institute for the Integrated Development of Natural Resources of the SB RAS and Tuva State University in 2015—2019 are considered. The results of coal analyzes of two typical coal mining of the Ulug-Khem coal basin with open and underground mining are presented, and the danger of dust and noise pollution of nearby pastures, catastrophic pollution of coal from the spawning of the Elegest spawning river, fires due to spontaneous combustion of coal are emphasized. There is possible influence of trace elements of coal — heavy metals, arsenic, mercury, etc. on the environment. Recommendations on improving the design and organization of coal mining enterprises, in particular on the placement of dumps and reclamation of their surface, as well as on the mandatory use of treatment facilities are made in the article.

scholarly journals The state of the coal industry of Donbass at the end of the XIX – at the beginningof the XX century

2020 ◽  
pp. 27-31
Author(s):  
І.В. Довжук
Keyword(s):  
Coal Mining ◽  
Underground Mining ◽  
Economic Benefits ◽  
Coal Industry ◽  
Economic Feasibility ◽  
Technical Improvement ◽  
Donetsk Basin ◽  
Xix Century ◽  
Coal Enterprises ◽  
Implementation Of Innovations

The article deals with the development of coal industry of the Donetsk basin and technical support of mineral fuel production in the mines of the region in the late XIX - early XX centuries. The last decade of the XIX century. characterized by the concentration of coal enterprises, which led to the widespread implementation of steam lifting, drainage and ventilation devices, the use of dynamite instead of gunpowder in the conduct of underground mining; construction of better equipped and capital super-mine technological complexes. It is noted that the coal mining enterprises of Donbass in 1914, although technically lagging behind the leading capitalist countries, were relatively modernized and showed positive tendencies to their further improvement.One of the major drawbacks of the beginning of the development of the Donbass coal industry was the lack of advanced machinery.  By the middle of 1914 at least 12 types of felling machines were already actively used in the mines of the Donetsk basin, moreover, the supply of disk and rod machines was carried out by British factories, chain - American, shock - British, American, and German. Cutting machines belonged to the heavy type and cost several times more than percussion. Cutting machines were driven by pneumatic or electropneumatic engines. It was emphasized that miners in search of maximum optimization and productivity of coal mining were increasingly concerned about the technical improvement of their enterprises, as the introduction of appropriate innovations could significantly affect the economic feasibility and profitability of enterprises. This was required by the technological necessity in connection with the expansion of production and the constant shortage of labor. Foreign owners and shareholders who tried to introduce advanced technologies of their countries played an important role in the implementation of innovations. In addition, technical improvements in mining processes not only brought economic benefits to their owners, but sometimes indirectly improved working conditions and safety at mining facilities.

scholarly journals Geotouristic attractions of the Ostrava part of the Upper Silesian Basin: geological and environmental sites

2017 ◽  
Vol 8 (2) ◽  
pp. 50-57
Author(s):  
Jakub Jirásek ◽  
Lenka Petrušková ◽  
Martin Sivek
Keyword(s):  
Coal Mining ◽  
Mine Water ◽  
Bituminous Coal ◽  
Underground Mining ◽  
Drainage System ◽  
Environmental Issues ◽  
Water Drainage ◽  
Geological Features ◽  
Burning Coal ◽  
Environmental Burdens

Abstract In the Ostrava part of the Upper Silesian Basin there are many geotouristic sites connected with the underground mining of Carboniferous bituminous coal. Text is focused on those related to the geology of the Basin and environmental issues connected to coal mining. Of great intrest are outcrops of Mississippian sediments of the paralic Ostrava Formation, as well as two most important museums with permanent geological exhibitions. Some interesting geological features conncted to younger periods of Quarternary glaciation are also mentioned. Two types of publicly accessible sites related to the environmental burdens (burning coal heaps, saline mine water drainage system) are also described.

scholarly journals Combined Method of Coal Mining in the Opening of Shallow Layers as a Direction of Innovative Development of Geotechnology

2021 ◽  
Vol 315 ◽  
pp. 01006
Author(s):  
Tatiana Tyuleneva ◽  
Roman Shishkov ◽  
Elena Kucherova ◽  
Marat Moldazhanov
Keyword(s):  
Coal Mining ◽  
Underground Mining ◽  
Methodological Approach ◽  
Production Capacity ◽  
Open Pit ◽  
Open Pit Mining ◽  
Mining Operations ◽  
Balanced Development ◽  
Coal Reserves ◽  
The Cost

In recent years, there has been a decline in the efficiency of coal mining by traditional methods. On the one hand, the volume of coal outside the contour of the cut, which is economically impractical for open-pit mining, is increasing. On the other hand, when using underground geotechnology, the cost of production exceeds the cost of performing mining operations using open geotechnology, this is due to differences in the factors of operation of the open pit and the mine. This circumstance determines the use of open-underground technology for mining coal reserves outside the contour of the open pit as an actual and promising direction. This article describes a methodological approach based on the use of technological schemes for the preparation and treatment of reserves of powerful shallow coal seams, the justification of the parameters of combined geotechnology with a coordinated and balanced development of open and open-underground mining operations with the distribution of reserves for open and open-underground mining of coal reserves beyond the limit contour of the open pit, the preparation of excavation sites directly from its workings and the coordination of production capacity and the speed of their development. Its application will increase the production capacity of the coal mining complex without additional environmental burden and will provide an increased return on investment.

Studies on, the Topsoil of an Underground Coal-mining Project

1994 ◽  
Vol 21 (2) ◽  
pp. 126-132 ◽  
Author(s):  
Nishit K. Kundu ◽  
Mrinal K. Ghose
Keyword(s):  
Coal Mining ◽  
Water Table ◽  
Agricultural Land ◽  
Underground Mining ◽  
Negative Impact ◽  
Sandy Loam ◽  
Field Capacity ◽  
Land Protection ◽  
Infiltration Rates ◽  
The Impact

The coal-mining industry plays a vital role towards meeting the energy demands of the people of India. Whether the mining is opencast or underground, however, it affects the environment and ecology of the region. Land is a non-renewable resource and is the main component damaged by mining. In India, exploitation of minerals was carried out in early days with virtually no regard for land protection. Underground mining causes subsidence of strata, mine fires, disturbance of the water-table, topographic disorder, and damage to the land-use pattern.A fact-finding survey was made at an underground coal project of Raniganj Coalfield in Eastern India, to assess the impact of mining on the topsoil, the study area being described. Generally the soils of the local agricultural land are brownish-grey and smooth while those of the ‘danga’ lands are yellowish brown with fine rock materials, the textural quality being, respectively, sandy loam and loamy sand. Field tests such as infiltration rate and field capacity were measured at all the sampling locations, and graphical representation of the infiltration rates are given.Infiltration rates of ‘danga’ land were found to be higher than those of agricultural land, due to their generally coarser texture. Field capacity of agricultural lands were found to range from 17.94 to 21.05%, and of ‘danga’ lands from 12.86 to 14.65%. Wilting coefficients were found to range from 5.31 to 6.75% for agricultural land and from 4.70 to 5.25% for ‘danga’ land. Bulk density, soil pH, conductivity, moisture content, and fertility status of the area, were also studied and the results discussed. Soils are deficient in nutrients. Kharif crops give an average yield of 5.05 quintals (each of 100 kg) per acre (0.405 ha) and Rabi crops only 4.88 quintals per acre. Underground mining activity will create land subsidence and disturb the water-table, finally having a negative impact on the topsoil of the area.

Study on the Comprehensive Consolidation and Ecological Reclamation of Coal Mining Areas in Jiaozuo

2013 ◽  
Vol 671-674 ◽  
pp. 2683-2686
Author(s):  
Jian Chun Fu ◽  
Rui Wang ◽  
Yan Li Chen
Keyword(s):  
Coal Mining ◽  
Land Subsidence ◽  
Underground Mining ◽  
Organic Fertilizer ◽  
Coal Waste ◽  
The Sustainable Development ◽  
Mining Areas ◽  
Ecological Problems ◽  
Reclaimed Soil ◽  
Waste Rocks

Land subsidence and ecological problems caused by underground mining threaten seriously the sustainable development of mining areas. An example of coal mining areas in the northwest of Henan province is studied. The subsided areas amount to 70 km2 and the maximum subsided depth is more than ten meters. A series of serious problems, such as soil erosion, soil fertility declining and vegetation degeneration, are caused by land subsidence. Engineering measures are adopted for the subsided lands in hilly areas to rebuild the land as types of terrace and gentle slope, and that in the plain to renovate with methods, such as drainage, filling with coal waste rocks or fly ashes, deepening lower subsidence and filling higher subsidence. At the same time, biological measures, such as planting peanuts, soybean and other legume perennial or annual herbs, and adding organic fertilizer are used to improve the reclaimed soil quality.

scholarly journals Numerical modeling of open pit (OP) to underground (UG) transition in coal mining

2016 ◽  
Vol 38 (3) ◽  
pp. 35-48 ◽  
Author(s):  
Phu Minh Vuong Nguyen ◽  
Zbigniew Niedbalski
Keyword(s):  
Numerical Modeling ◽  
Coal Mining ◽  
Surface Deformation ◽  
Underground Mining ◽  
Primary Objective ◽  
Open Pit ◽  
Open Pit Mining ◽  
Original Experiment ◽  
Surface Stability ◽  
The Impact

Abstract The primary objective of the present paper is an attempt at evaluating the influence of sub-level caving operations on the slope stability of a still-functioning open pit coal mine in Vietnam. Initially, various methods of predicting the impact of underground mining on surface stability are discussed. Those theoretical considerations were later utilized in the process of constructing a Flac-2D-software-based numerical model for calculating the influence of underground operation on the deformation and possible loss of stability of an open pit slope. The numerical analysis proved that the values of open pit slope displacements were affected mainly by underground exploitation depth, direction of operation (i.e., from one slope to the other) and the distance from the slope plane. Real geomechanical strata parameters from the Vietnamese coal basin of Cam Pha were used in the modeling process. The paper is, therefore, a critical review of the hitherto proposed methods of predicting the impact of underground operation (UG) on open pit mining (OP), illustrated with selected examples of case studies on OP-UG interaction, followed by an original experiment based on numerical modeling method. This is first such study for the genuine conditions of the coal mining in Vietnam. The obtained results, however, should not be generalized due to a highly specific character of the analyzed phenomenon of mining-induced surface deformation. The practical implications of the study may occur extremely useful in the case of an UG-OP transition. Such a transition is often necessary for both technical and economical reasons, as in some coal basins open pit operations at greater depths occur unfeasible, which calls for a proper selection of parameters for a planned underground operation.

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