scholarly journals Justification of Spatially-Planned Solutions and Determination of the Dimension Block in the Working of the Medium Thick Inclined Coal Seams with the Room and Pillar System

2018 ◽  
Vol 41 ◽  
pp. 01024
Author(s):  
Thang Pham Duc ◽  
Anh Phan Tuan ◽  
Viktor Vitcalov ◽  
Phuc Le Quang
Keyword(s):  
Technological Parameters ◽  
Coal Seams ◽  
Coal Basin ◽  
Working Face ◽  
Geological Conditions ◽  
Rational Length ◽  
Working Out ◽  
Quang Ninh ◽  
Excavation Area

Technological parameters for working out of the medium thick inclined coal seams with a diagonal arrangement of a line of a working face. An analysis of the constraints that apply the technology and the complexities of the mining and geological conditions of the Quang Ninh coal basin. The possibility and expediency of using the foreign experience of working out of the medium thick inclined coal seams in the mines of Vietnam and justification of spatially-planned solutions for working. The scheme of preparation and working out of the excavation area is given in view of the technological features in difficult mining and geological conditions, using the room and pillar system and determination of the rational length of the block along the strike.

scholarly journals DETERMINATION OF THE RATIONAL LENGTH OF THE BLOCK ALONG THE STRIKE FOR EXPANSION TO PROVIDE SAFETY AND EFFICIENCY IN THE WORKING OF THE MEDIUM THICK IN-CLINED COAL SEAMS WITH THE ROOM AND PILLAR SYSTEM IN THE QUANG NINH COAL BASIN

2018 ◽  
pp. 3-8
Author(s):  
Duc Thang Pham ◽  
Victor G. Vitcalov
Keyword(s):  
Coal Seams ◽  
Coal Basin ◽  
Foreign Experience ◽  
Geological Conditions ◽  
Rational Length ◽  
Working Out ◽  
Quang Ninh ◽  
Excavation Area

An analysis of the constraints that apply the technology and the complexities of the mining and geological conditions of the Quang Ninh coal basin. The possi-bility and expediency of using the foreign experience of working out of the me-dium thick inclined coal seams in the mines of Vietnam. The scheme of prepara-tion and working out of the excavation area is given in view of the technological features in difficult mining and geological conditions, using the room and pillar system and determination of the rational length of the block along the strike.

scholarly journals Analytical and Mining Experimental Studies about the Character of Interaction on the Mechanized Supports of ZQY3600/12/28 at the Quang Hanh Mine in the Quang Ninh Coal Basin

2018 ◽  
Vol 41 ◽  
pp. 01036
Author(s):  
Thang Duc ◽  
Huynh Ngoc
Keyword(s):  
3D Model ◽  
Experimental Studies ◽  
Coal Seams ◽  
Coal Basin ◽  
Mechanized Support ◽  
Deformation State ◽  
Mining Works ◽  
Roof Rocks ◽  
Working Out ◽  
Quang Ninh

Complex studies using measuring stations for working out inclined coal seams of medium thick with the use of longwall, combining in a certain extracting area of mining works and instruments for measuring the bearing rock pressure and the displacement of the roof rocks adjacent to the longwall. The parameters of stress intensity distribution were placed during the working out of the extracting area. Installation of reaction dynamics mechanized support along the strike of extracting area. Suggestion 3D-model shows stress-deformation state of the rock massif in all of extracting area.

DETERMINATION OF THE RATIONAL BACKFILLING PARAMETERS DURING SELECTIVE EXTRACTION TECHNOLOGY OF THIN COAL SEAMS

2021 ◽  
pp. 28-36
Author(s):  
Dmytro Malashkevych ◽  
◽  
Mykhailo Petlovanyi ◽  
Kateryna Sai ◽  
◽  
...  
Keyword(s):  
Coal Seam ◽  
Rock Strength ◽  
Coal Extraction ◽  
Filling Material ◽  
Technological Parameters ◽  
Coal Seams ◽  
Extraction Technology ◽  
Geological Conditions ◽  
Selective Mining

Purpose. Substantiation of the backfill massif parameters in fully mechanized selective mining thin coal seams, taking into account the influence of technological and mining-and-geological conditions. Methods. The integrated approach which includes the analysis and generalization of scientific developments in the field under study, analytical and numerical methods for determining technological parameters is used in the work. Findings. The results of studies of the influence of complex technological and mining-and-geological conditions on filling massif parameters while selective mining are given in the paper. Using the example of numerical calculation methods for the selected initial characteristics of the mined coal seam the following trends are revealed: the shrinkage value of the filling material Eв from the ultimate rock strength σст and the relative density γв; the length of the filling mined-out space lз and the size of the undercut rocks mпр, the filling density γв and the technological gap Δhтех; the initial height of the filling massif formation hЗ and the effective seam thickness mеф from the support resistance Pк and the rock strength of the filling material σст. Originality consists in the determination of the change regularities in the roof subsidence and deformation of the filling massif from the technological parameters of the site and the face support while effective coal seam development by technological scheme of selective coal extraction. Practical implication. The research results can be used in the design of technological schemes for coal mining with backfilling and leaving waste rocks in the worked-out area. Key words: backfilling of worked-out space, selective technology, parameters, regularities.

scholarly journals Optimizing Simulation and Analysis of Automated Top-Coal Drawing Technique in Extra-Thick Coal Seams

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 232 ◽  
Author(s):  
Qunlei Zhang ◽  
Ruifu Yuan ◽  
Shen Wang ◽  
Dongyin Li ◽  
Huamin Li ◽  
...  
Keyword(s):  
Numerical Models ◽  
Time Estimation ◽  
Engineering Practice ◽  
Coal Seams ◽  
Control Approach ◽  
Working Face ◽  
Geological Conditions ◽  
Round Number ◽  
Element Approach ◽  
Drawing Technique

A particle element approach based on continuum-discontinuum element method (CDEM) is applied to optimize the automated top-coal drawing techniques in extra-thick coal seams. Numerical models with 100 drawing openings are created according to the field engineering geological conditions of Tongxin coal mine in China. An automated coal drawing control approach in numerical modelling based on time criterion is proposed. The rock mixed rate, top-coal recovery rate and the variance of the drawn top coal amount are counted and set as the statistical indicators to evaluate the top-coal drawing techniques. The traditional top-coal drawing criterion, “rocks appear, close the opening”, leads to low recovery of top coal and waste of coal resources in extra-thick coal seams, significantly weakening the transport stability and efficiency of the scraper conveyer. A three-round unequal time top-coal drawing technique is proposed for automated top-coal drawing. Three drawing openings, corresponding to the three top-coal drawing rounds respectively, are working at the same time; in each round, the top-coal drawing sequence is from the first drawing opening at one end of the working face to last drawing opening at another end; the drawing time of each round is not equal and increases with the round number. The numerical inversion approach of iteration steps can be used for real top-coal drawing time estimation and automated drawing process design to achieve a better top coal drawing effect, while the exact time for each drawing round still needs to be corrected by engineering practice.

scholarly journals Determination of the Technological Parameters of Borehole Underground Coal Gasification for Thin Coal Seams

2013 ◽  
Vol 12 (3) ◽  
pp. 8-16 ◽  
Author(s):  
Volodymyr S. Falshtynskyi ◽  
Roman O. Dychkovskyi ◽  
Vasyl G. Lozynskyi ◽  
Pavlo B. Saik
Keyword(s):  
Coal Gasification ◽  
Underground Coal Gasification ◽  
Technological Parameters ◽  
Coal Seams

scholarly journals Determination of the Technological Parameters of Borehole Underground Coal Gasification for Thin Coal Seams

2021 ◽  
Vol 12 (3) ◽  
Author(s):  
Volodymyr S. Falshtynskyi ◽  
Roman O. Dychkovskyi ◽  
Vasyl G. Lozynskyi ◽  
Pavlo B. Saik
Keyword(s):  
Coal Gasification ◽  
Underground Coal Gasification ◽  
Technological Parameters ◽  
Coal Seams

scholarly journals Study on the Influence of Snow Melt Water in Tianshan Mountains on the Water Filling of Yili No. 1 Mine and the Prevention of Water Hazards

2021 ◽  
Author(s):  
Lin Feng ◽  
Yajun Sun ◽  
Chenghang Zhang ◽  
Zhimin Xu ◽  
Zewen Yuan ◽  
...  
Keyword(s):  
Treatment Plan ◽  
Water Discharge ◽  
Water Inrush ◽  
Tianshan Mountains ◽  
Tianshan Mountain ◽  
Coal Seams ◽  
Water Release ◽  
Working Face ◽  
Geological Conditions ◽  
Water Filling

Abstract Yili No.1 Mine locates opposite Tianshan Mountain in Yili Prefecture, Xinjiang. The main coal seams are No.3 and No.5 coal seams. The alluvial strata cover the surface of the minefield in the piedmont of the Tianshan Mountains. Snowmelt in the Tianshan Mountains is an essential source of replenishment for surface water and alluvial strata in the basin. Due to the particular diagenetic environment and geological conditions, coal mining is mainly affected by weakly cemented sandstone aquifers on the roof and floor. To solve the water hazard problems of the No.3 coal roof and the No.5 coal floor faced by the mine, we take the 1520w first mining face of Yili No.1 Mine as the research object. And through drilling and on-site water release tests, the threat of water inrush from the working face of the study area and the treatment plan are analyzed. The results show that the Quaternary aquifer in the study area is thin in thickness and fast in velocity. Therefore, it mainly flows through the site in the form of “slope transit flow”, which has little impact on the roof water filling of the No.3 coal seams. In addition, the floor water discharge test proved that the sandstone aquifer of the No.5 coal seam floor has the characteristics of dredging. To eliminate the threat of water inrush during the next mining step in the mine, we proposed arranging an “L”-shaped drainage project in the first working face. And the dredging effect was pronounced and can ensure the safety of mining. At the same time, it has essential reference significance for the mining work of other similar mines in the western region.

Recent Patents on Thin Coal Seam Mining Equipment

2020 ◽  
Vol 13 (2) ◽  
pp. 99-108
Author(s):  
Yanxiang Wang ◽  
Daolong Yang ◽  
Bangsheng Xing ◽  
Tingting Zhao ◽  
Zhiyi Sun ◽  
...  
Keyword(s):  
Coal Seam ◽  
Underground Space ◽  
Mining Method ◽  
Mining Equipment ◽  
Coal Seams ◽  
Thin Coal Seam ◽  
Recoverable Reserves ◽  
Working Face ◽  
Geological Conditions ◽  
Seam Mining

Background:: China's thin and extremely thin coal seam resources are widely distributed and rich in reserves. These coal seams account for 20% of the recoverable reserves, with 9.83 billion tons of industrial reserves and 6.15 billion tons of recoverable reserves. Objective: Due to the complex geological conditions of the thin coal seam, the plow mining method cannot be effectively popularized, and the drum mining method is difficult to be popularized and applied in small and medium-sized coal mines, so it is necessary to find other more advantageous alternative mining methods. Methods: The equipment integrates mining operations, conveying operations, and supporting operations, and is suitable for mining short and extremely thin coal seam with a height of 0.35m-0.8m and width of 2m-20m. It has the advantages of the low body of the shearer, no additional support on the working face, and small underground space. The mining efficiency of thin coal seam and very thin coal seam can be improved and the mining cost can be reduced. Results: Thin coal seam shear mining combines mining, conveying, and supporting processes together and has the advantages of a low fuselage, no extra support required for the working face, and feasibility in a small underground space. Conclusion: The summarized mining method can improve the mining efficiency of thin and extremely thin coal seams, reduce mining costs, and incorporate green mining practices, which take both mining economy and safety into account.

scholarly journals Chemometric Study of Trace Elements in Hard Coals of the Upper Silesian Coal Basin, Poland

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Adam Smoliński ◽  
Przemysław Rompalski ◽  
Krzysztof Cybulski ◽  
Jarosław Chećko ◽  
Natalia Howaniec
Keyword(s):  
Trace Elements ◽  
Average Concentration ◽  
Chemical Parameters ◽  
Coal Processing ◽  
Coal Seams ◽  
Coal Basin ◽  
Potential Threat ◽  
Upper Silesian Coal Basin ◽  
Geological Conditions ◽  
Physical And Chemical

The objective of the study was the analysis of trace elements contents in coals of the Upper Silesian Coal Basin (USCB), which may pose a potential threat to the environment when emitted from coal processing systems. Productive carbon overburden in central and southern zones of the USCB is composed mostly of insulating tertiary formations of a thickness from a few m to 1,100 m, and is represented by Miocene and Pliocene formations. In the data study the geological conditions of the coal seams of particular zones of the USCB were taken into account and the hierarchical clustering analysis was applied, which enabled the exploration of the dissimilarities between coal samples of various zones of the USCB in terms of basic physical and chemical parameters and trace elements contents. Coals of the northern and eastern zones of the USCB are characterized by high average Hg and low average Ba, Cr, and Ni contents, whereas coals of southern and western zones are unique due to high average concentrations of Ba, Co, Cu, Ni, and V. Coals of the central part of the USCB are characterized by the highest average concentration of Mn and the lowest average concentrations of As, Cd, Pb, V, and Zn.

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