Planning aids for mining coal seams by special surveying techniques (in German and English)

1980 ◽  
Vol 17 (5) ◽  
pp. 90
Keyword(s):  
Coal Seams ◽  
Mining Coal

scholarly journals Peculiarities of using classification indicators of the coal metamorphism degree for predicting the hazardous coal seams properties

2020 ◽  
Vol 201 ◽  
pp. 01014
Author(s):  
Mykola Antoshchenko ◽  
Elvira Filatieva ◽  
Vladyslav Yefimtsev ◽  
Vadym Tarasov
Keyword(s):  
Spontaneous Combustion ◽  
Chemical Activity ◽  
Mining Engineering ◽  
Coal Seams ◽  
Mining Operations ◽  
Emergency Situations ◽  
Specific Composition ◽  
Geological Conditions ◽  
Definition Of ◽  
Mining Coal

Currently, there is no reliable regulatory framework for determining the hazardous properties of coal seams, including the propensity of coal for spontaneous combustion. Under relatively identical mining engineering and geological conditions for mining coal seams, the probability of emergency situations is determined to a large extent by the genetic properties of coal. The research methodology is based on the classical definition of metamorphism, which characterizes the change in the composition and properties of coal. The analysis involves indicators that directly or indirectly characterize the elemental composition of organic and mineral mass, chemical activity and physico-mechanical properties. This will allow to establish a specific composition and properties that contribute to the manifestation of certain hazardous properties of coal seams during mining operations. It is shown that the modern industrial classification does not take into account the change in the organic and mineral constituents of coal, which does not make it possible to use it unchanged to predict the hazardous properties of coal seams.

scholarly journals Operational Control of the Feed of the Harvester

2019 ◽  
Vol 105 ◽  
pp. 01009
Author(s):  
Sergey Kubrin ◽  
Konstantin Kopylov
Keyword(s):  
Operational Control ◽  
Coal Seams ◽  
Mining Operations ◽  
Technological Processes ◽  
Mining Enterprise ◽  
Geological Conditions ◽  
Operational Management ◽  
Mining Coal ◽  
The Right ◽  
Planning Production

Comparison of normative and actual indicators on mining testifies to inefficient work of the excavating equipment. The results of the correlation analysis of the speed of movement of the harvester relative to the section of the support with the readings of methane sensors revealed a significant dependence. When conducting mining operations in complex geological conditions at great depths, a joint step-by-step carrying out of various technological processes is required to ensure the preparation, opening and excavation of reserves and the creation of safe conditions for mining coal seams. At the same time, efforts should be made to minimize time, human and energy resources. In this regard, of particular importance is the right choice of the program of operational management of technological processes of mining, monitoring the implementation of technological operations for the timely detection of deviations from the selected mode, adjustment of the established current modes of operation of technological processes and the development, if necessary, measures aimed at reducing the risks of accidents. A promising direction of solving this problem is the use of modeling methods. The developed models of technological processes of the mining enterprise will allow planning production and supporting decision-making in the implementation of operational management.

Possible applications of multi-bucket scrapers for shield mining coal seams

1968 ◽  
Vol 4 (5) ◽  
pp. 550-552
Author(s):  
P. É. Mal'bert ◽  
N. S. Lavrov ◽  
Yu. I. Alkasarov
Keyword(s):  
Coal Seams ◽  
Mining Coal

Comparison of rockburst occurrence during extraction of thick coal seams using top-coal caving versus slicing mining methods

2018 ◽  
Vol 55 (10) ◽  
pp. 1433-1450 ◽  
Author(s):  
Zhen-lei Li ◽  
Xue-qiu He ◽  
Lin-ming Dou ◽  
Da-zhao Song
Keyword(s):  
Conceptual Model ◽  
Extraction Process ◽  
Mining Method ◽  
Fracture Zones ◽  
Coal Seams ◽  
Prone Area ◽  
Mining Coal ◽  
Mine Openings ◽  
Method Of Extraction

In recent years, rockbursts have occurred frequently during the mining of thick coal seams in China. Use of the top-coal caving or slicing mining method to extract these thick seams may result in distinct geomechanical responses in the strata and, in turn, the pattern of rockburst occurrence around longwall layouts. To establish a thorough understanding of which method (caving or slicing) is better when it comes to preventing rockbursts during the extraction process, a suite of in situ rockburst measurements was conducted. Six typical rockburst-prone collieries were monitored during which a total of 110 rockburst events occurred. Numerical modelling was used to help interpret the observations. Here, we focus on the analysis of these field observations and the numerical simulations employed to develop a conceptual model for rockburst occurrence during caving mining of thick coal seams. We find that caving mining has a certain rockburst-reducing effect in that the method significantly decreases, or even avoids, the occurrence of rockbursts at coalfaces. Moreover, it reduces the scope of the damage likely to be incurred and the severity and frequency of rockbursting. According to the conceptual model, the rockburst-prone area during caving mining is generally the roadway section located a certain distance ahead of the coalface. This distance, which is roughly 10–54 m, is consistent with the rockburst damage observed on site (mostly 10–50 m ahead of the coalface). This rockburst pattern arises because caving mining results in reduced stress concentration, less bottom coal being retained, and wider-ranging fracture zones around the mine openings, especially ahead of the coalface. This makes the rock surrounding the mine openings less likely to accumulate high levels of elastic energy that need releasing and hence it is more difficult to induce rockbursting. Therefore, it is recommended that the top-coal caving method should be the preferred method of extraction when mining coal seams of a certain thickness.

The Study on Roadway Layout in Coordination of Mining Coal Seams Base on Failure of Floor Strata

2014 ◽  
Vol 889-890 ◽  
pp. 1362-1374 ◽  
Author(s):  
Yong Zhang ◽  
Chun Lei Zhang ◽  
Chun Chen Wei ◽  
Ya Dong Liu ◽  
Shi Qing Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Coal Seam ◽  
Coal Mining ◽  
Coal Mine ◽  
Simulation Software ◽  
Coal Seams ◽  
Group Coordination ◽  
Mining Coal ◽  
Two Sides

In order to make sure the reasonable roadway layout in lower seam of close coal mining group coordination in Lijiahao coal mine, firstly, applying the theoretical analysis and geological radar detection to get the influence depth of mining from the up coal seam 2-2 to the floor is about 20m, the results show that the thickness of complete strata is about 15m, then determining to use the outward alternate entries in lower seam roadway by using theoretical analysis. At last, determining the distance of outward alternate entries is 12-14m by using FLAC3D numerical simulation software to simulate the change of stress and displacement in roof floor and two sides of roadway.

scholarly journals Appendix: Economic Geology: Exploration for coal, oil and minerals

1997 ◽  
Vol 17 (1) ◽  
pp. 449-454 ◽  
Keyword(s):  
Academic Research ◽  
The Political ◽  
Geological Exploration ◽  
Coal Seams ◽  
Mineral Wealth ◽  
Political Implications ◽  
The Status ◽  
Comprehensive Survey ◽  
Mining Coal

AbstractThe incentive for most geological exploration has been related to the possibility of mineral wealth. Some has been undertaken by industry, other as a result of national interest. A great deal of academic research, particularly since 1960, has been financed by industry. It is impossible with financial pressures so strong to disentangle the presentation of research as between 'fundamental' and 'applied'. This section, summarizes the explicit search for hydrocarbons (coal and petroleum) and metalliferous and other minerals which in various ways has been alluded to in the preceding chapters. It is not intended as a comprehensive surveyCoal seams crop out extensively in Svalbard and, being conspic-uous in cliffs and talus, have been exploited in surface workings for fuel by whalers and hunters from the earliest days.The potential for mining and export and the political implications was increasingly realised from the later years of the Nineteenth Century. Until the status of Spitsbergen and Bjornoya was settled, coal was a political consideration and when the Treaty protected international commercial rights, economic facts slowly displaced political manoeuvring until the present situation where purely commercial considerations hardly make mining coal for export competitive. Coal occurrences may also have a potential for natural gas, possibly with similar competitive limitations with the present perception of offshore resources.Coal, being the only mineral effectively exploited, has focused research on coal-bearing strata. This review treats coal in situ from a stratigraphic-regional viewpoint beginning with the youngest seams. Further discussion in a stratigraphic context can be found

scholarly journals Improvement of Continuous Lateral Surface Mining Method for Coal Extraction from Closed Mines’ Pillars

2020 ◽  
pp. 542-562
Keyword(s):  
Dust Emission ◽  
Surface Mining ◽  
Economic Benefits ◽  
Coal Extraction ◽  
Mining Method ◽  
Coal Seams ◽  
Coal Deposits ◽  
Underground Mine Workings ◽  
Coal Pillars ◽  
Mining Coal

The presented paper deals with a continuous lateral method of closed mines' coal pillars surface mining and its advantages in land intensity, dust emissions, maximizing coal extraction, and overburden transporting costs. While inclined and steep coal seam strata in the pillars are widely exploited with land-and-cost intensive deepening longitudinal mining method, this article substantiates the choice of modification of block-and-layer continuous lateral mining method for different kinds of coal deposits. The aim of the study is to specify the modifications of the method proposed, define the stages of their carrying out, and emphasize the advantages over deepening longitudinal method of coal pillars surface mining. The basic principle of the proposed continuous lateral method of mining the coal pillars is limiting the final depth of quarry by the vertical height of the first floor of the underground mine workings. The continuous lateral mining method is detailed in the article in three modifications (for development coal seams strata of high and medium thickness, as well as distanced separate coal seams), which advantages are low land intensity and dust emission from the dump. Attention is also paid to the economic benefits of the block-and-layer continuous lateral method of mining coal pillars of closed mines, whereby the overburden transporting costs can be significantly reduced, while limitations of the proposed mining method concern specific sites of closed mines that make up a small part of the coal pillars extracted by surface mining today.

scholarly journals Determination of Water-Proof Coal (Rock) Pillar Height in Mining Coal Seam Group under Water-Bearing Rock Stratum

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Feng Wan ◽  
Hongqing Zhang ◽  
Peijun Zhou ◽  
Jie Guo
Keyword(s):  
Fracture Zone ◽  
Coal Seams ◽  
Rock Stratum ◽  
Pillar Height ◽  
Rock Pillar ◽  
Maximum Value ◽  
Coal Rock ◽  
Mining Coal ◽  
Water Proof

In order to determine the reasonable height of water-proof coal (rock) pillar when mining multiple coal seams under aquifer, this paper analyzes the expansion height of water-conducting fracture zone when coal seams mining. Considering the expansion law of water-conducting fracture zone in coal seams mining, two schemes of coal seams mining in upper and lower groups and one-time mining of all coal seams are designed for comparative analysis, and the height of water-proof coal (rock) pillar is determined based on the expansion height of water-conducting fracture zone. The results show that the height of water-proof coal (rock) pillar is calculated as 91.08 m when mining upper and lower groups and 105.46 m when mining all coal seams at the same time. According to UDEC numerical simulation results, the height of water-proof coal (rock) pillar is 56.08 m when mining upper and lower groups and 86.36 m when mining all coal seams at the same time. Comparing the results of theoretical calculation and numerical analysis, the maximum value is selected as the final result, and the reasonable water-proof coal (rock) pillar height is determined to be 105.46 m.

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