Recommended Ventilation Techniques to Be Used in Coal Mines Which Are Subjected to the Adverse Mining Conditions of Mine Fires

1987 ◽  
pp. 75-102
Author(s):  
R. MORRIS
Keyword(s):  
Coal Mines ◽  
Mining Conditions ◽  
Mine Fires

scholarly journals Long-term Analysis of the Effects of Production Management in Coal Mining in Poland

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3146 ◽  
Author(s):  
Izabela Jonek-Kowalska
Keyword(s):  
Coal Mining ◽  
Production Management ◽  
Coal Mines ◽  
Work Productivity ◽  
Policy Implications ◽  
Productivity Improvement ◽  
Mining Conditions ◽  
The Stability ◽  
Efficiency And Productivity

The primary aim of this article is to examine financial efficiency and work productivity, as well as their determinants, in selected Polish coal mines in 1998–2015. To achieve this goal, after introducing a justification for the choice of subject and the literature studies, the research methodology is presented, and research results are subsequently described and analyzed. Next, based on the main conclusions, model regularities and policy implications regarding efficiency and productivity improvement in Polish coal mining enterprises are established. The research for this study was conducted in five Polish coal mines, which were chosen on the basis of criteria aimed at ensuring the results’ comparability and the stability of organizational and mining conditions in the analyzed research period.

scholarly journals Rockburst of parameters causing mining disasters in Mines of Upper Silesian Coal Basin

2018 ◽  
Vol 36 ◽  
pp. 03005 ◽  
Author(s):  
Renata Patyńska ◽  
Adam Mirek ◽  
Zbigniew Burtan ◽  
Elżbieta Pilecka
Keyword(s):  
Natural Hazards ◽  
Seismic Activity ◽  
Coal Mines ◽  
High Energy ◽  
Coal Basin ◽  
Structural Units ◽  
The Past ◽  
Upper Silesian Coal Basin ◽  
Mining Conditions ◽  
Weak Earthquakes

In the years 2001-2015, 42 rockbursts were recorded in Polish coal mines. For the past 15 years the scale of the phenomena has been similar and ranges from 1 to 5 rockbursts per year. However, the number of recorded high energy seismic tremors of 108 and 109J (E) energy that has occurred in recent years, 2 to 5, is alarming. According to the data, 27 of tremors of E > 108 J energy that occurred between 2001 and 2015 caused 3 rockbursts. Confronting these data with seismic activity from 1989-2000, it should be noted that only 2 events out of 99 rockbursts caused tremors with energies of E>108 J. Against the background of the scale of seismic and rockburst hazards, the geological and mining conditions of the Upper Silesian Coal Basin (USCB) have been analysed, detailing the structural units in which the rockbursts occurred. On this basis, the author characterised factors that impacts on the mining excavations resulting in rockbursts that caused damage on a larger scale. These rockbursts had the characteristics of mining catastrophes and weak earthquakes not recorded in mining statistics of natural hazards of USCB so far.

scholarly journals Characterization of Particulates from Australian Underground Coal Mines

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 447
Author(s):  
Nikky LaBranche ◽  
Cigdem Keles ◽  
Emily Sarver ◽  
Kelly Johnstone ◽  
David Cliff
Keyword(s):  
Particle Size ◽  
Coal Mines ◽  
Respirable Dust ◽  
Particle Size Distributions ◽  
Exposure Monitoring ◽  
Underground Coal Mines ◽  
Mining Conditions ◽  
Coal Workers Pneumoconiosis ◽  
Coal Workers

The re-identification of coal workers’ pneumoconiosis in Queensland in 2015 has prompted improvements in exposure monitoring and health surveillance in Australia. The potential consequences of excessive exposure to respirable dust may depend upon the size, shape and mineralogical classes of the dust. Technology has now advanced to the point that the dust characteristics can be explored in detail. This research collected respirable dust samples from four operating underground coal mines in Australia for characterization analysis using scanning electron microscopy (SEM) with energy dispersive X-ray (EDX). The research found multiple mineralogical classes present with their own particle size distributions. The variation between mines appears to have had a larger effect on particle size distribution than the differences in mining processes within individual mines. This may be due to variations in the geologic conditions, seam variation or mining conditions.

Methodology of Risk Analysis of Endogenous Fire in Coal Mines

2014 ◽  
Vol 962-965 ◽  
pp. 1153-1157 ◽  
Author(s):  
Marian Šofranko
Keyword(s):  
Risk Analysis ◽  
Coal Mine ◽  
Spontaneous Combustion ◽  
Coal Mines ◽  
Mining Operations ◽  
Self Heating ◽  
Mining Conditions ◽  
Endogenous Fire ◽  
Negative Effect ◽  
Relevant Factors

In coal mines one of the most serious safety problems are endogenous fires. Given the specific mining conditions a number of self-heating and spontaneous combustion occurs in coal mining. These activities have a negative effect on the organization of mining operations and require a variety of interventions for their disposal and are a considerable economic burden. At the same time in case of suitable conditions threaten of their transition in the explosion exists. For the application of appropriate measures it is necessary to know the size of the risk of endogenous fires in the coal mine. The paper therefore describes a methodology for risk analysis of endogenous fire in a coal mine, taking into account all relevant factors of production.

Analysis of Yielding Steel Arch Support with Rock Bolts in Mine Roadways Stability Aspect

2014 ◽  
Vol 59 (3) ◽  
pp. 641-654 ◽  
Author(s):  
Tadeusz Majcherczyk ◽  
Zbigniew Niedbalski ◽  
Piotr Małkowski ◽  
łukasz Bednarek
Keyword(s):  
Support System ◽  
Support Systems ◽  
Coal Mines ◽  
Rock Bolt ◽  
Rock Bolts ◽  
Mining Conditions ◽  
Arch Support ◽  
The Stability ◽  
Rock Bolt Support ◽  
Rockbolt Support

Abstract The result of the search for new technological solutions in the field of support for roadways in coal mines has in recent years been the widespread use of steel arch with rockbolt support systems. The efficiency of these systems is affected among other things by the option of installing rock bolts after the actual driving the mine roadway, the increased load capacity that these systems can support, and their resistance to dynamic weight. Large variation in the way that these steel arch support can be connected using different types of rock bolts necessitates mining research revealing the effectiveness of such solutions. Although the steel arch with rockbolt support system is used in the majority of European coal mines, it is still not possible to apply templates of schemes due to the diversity of geological and mining conditions. Therefore, throughout a period of several years, the authors of this article conducted research in situ under conditions of different schemes related to connecting arched support frames with rock bolts, with only selected results being presented in the article. The measurements of convergence, load supported by the system frame, load supported by the rock bolts, and the stratification of roof rocks were analyzed, carried out in two roadways with yielding steel arch support in which strand bolts were applied. The article also proposes the index for working maintenance nuw, used in preliminarily assessing the stability of a given working with a limited number of data concerning geomechanical conditions. Additionally considered are empirical methods used in Poland for designing steel arch with rock bolt support systems. The results of mine research indicate that strengthening yielding steel support with strand bolts through steel beams maintains the stability of a roadway, even when exposed to the exploitation stress. Aside from the impact of exploitation, deformations of the support system are negligible, despite the fact that the tensile forces acting on the rock bolts can reach values of up to 160 kN. Under favorable geological and mining conditions, support system frames can be spread up to 1.5 m apart when using rock bolts between them. The conducted measurement of convergence during a three year period revealed a compression amounting to a few centimeters. The results obtained by the research fully confirm the effectiveness of combined yielding steel arch with rock bolt support systems under different mining conditions.

scholarly journals Monitoring of Roof Bolting as an Element of the Project of the Introduction of Roof Bolting in Polish Coal Mines—Case Study

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 95
Author(s):  
Artur Dyczko ◽  
Paweł Kamiński ◽  
Jacek Jarosz ◽  
Zbigniew Rak ◽  
Dariusz Jasiulek ◽  
...  
Keyword(s):  
Coal Mines ◽  
Underground Mines ◽  
Validity And Reliability ◽  
Coal Basin ◽  
Roof Bolting ◽  
Rock Bolting ◽  
Underground Coal Mines ◽  
Mining Conditions ◽  
Evaluation Of Data

Roof bolting is the most popular type of support for underground mines’ workings. However, in Polish coal mines it is used only as a supplementary support. To raise the effectiveness and economic score of horizontal development works, JSW (Jastrzębska Spółka Węglowa) started a project to introduce the independent rock bolting support in its mines. The key element of the project is the monitoring of mine workings supported with roof bolting, as appropriate control allows one to ensure a proper level of safety. The following work presents a monitoring system for mine working supported with roof bolting applied in the project, as well as results of the measurements obtained using this system. The aim of the monitoring was to prove that independent roof bolting provides a proper level of safety and thus is applicable in conditions of Polish underground coal mines, particularly Budryk mine. It was to be proved by the evaluation of data obtained from instrumented bolts, extensometers of different type and convergence measurements. These results allowed us to verify the validity and reliability of the roof bolting in geological and mining conditions of Silesian Coal Basin.

Comparison of Methane Drainage Methods Used in Polish Coal Mines

2014 ◽  
Vol 59 (3) ◽  
pp. 655-675 ◽  
Author(s):  
Nikodem Szlązak ◽  
Marek Borowski ◽  
Dariusz Obracaj ◽  
Justyna Swolkień ◽  
Marek Korzec
Keyword(s):  
Methane Concentration ◽  
Ventilation System ◽  
Coal Mines ◽  
Methane Emissions ◽  
Main Method ◽  
High Effectiveness ◽  
Methane Drainage ◽  
Longwall Panel ◽  
Mining Conditions ◽  
Mine Workings

Abstract Methane drainage is used in Polish coal mines in order to reduce mine methane emissions as well as to keep methane concentration in mine workings at safe levels. This article describes methods of methane drainage during mining used in Polish coal mines. The first method involves drilling boreholes from tailgate roadway to an unstressed zone in roof or floor layers of a mined seam. It is the main method used in Polish mining, where both the location of drilled boreholes as well as their parameters are dependent on mining and ventilation systems of longwalls. The second method is based on drilling overlying drainage galleries in seams situated under or over the mined seam. This article compares these methods with regard to their effectiveness under mining conditions in Polish mines. High effectiveness of methane drainage of longwalls with different ventilation and methane drainage systems has been proven. The highest effectiveness of methane drainage has been observed for the system with overlying drainage gallery and with the parallel tailgate roadways. In case of classic U ventilation system of longwall panel, boreholes drilled from the tailgate roadway behind the longwall front are lost.

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