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Oct 01, 2018· Field studies of topcoal caving mining have been conducted in Tangshan 43 and Zhaogezhuang 44 mines in China to prevent rockbursts and obtained good effects as a result. By analysing the overburden and abutment stress distributions in topcoal caving mining, scholars45, 46, 47 studied the relieving effects of topcoal caving mining on rockbursts.
mechanized topcoal caving mining, which not only affects the recovery of topcoal, but also affects the quality of the coal. This paper studies the arching phenomenon in topcoal caving mining process of ultrathick coal seam. A series of laboratory granular material simulation experiments were
In the case of the thick and gentle coal seam no. 3 of the Jiu Valley Coal Basin (Romania), the mining methods are by use of the longwall mining technologies with roof control by caving or top coal caving. In this paper, it is presented the analysis of the complex deformations of the ground surface, over time, as a consequence of the coal mining in certain mining fields of the basin.
Procedia Earth and Planetary Science 1 (2009) 219 226 The 6th International Conference on Mining Science Technology Technique of top coal caving with vibration Xie Yaoshea,b,*, Zhao Yangshengc aSchool of Mines, China University of Mining and Technology, Xuzhou 221116, China bState Key Laboratory of Coal Resource and Mining Safety, Xuzhou 221008, China cSchool of Mining .
The top coal caving with vibration technique has a higher coal recovery ratio. This technique improves the top coal broken effect and lowers the waste content rate.
Sep 01, 2009· Procedia Earth and Planetary Science 1 (2009) 219 226 The 6th International Conference on Mining Science Technology Technique of top coal caving with vibration Xie Yaoshea,b,*, Zhao Yangshengc aSchool of Mines, China University of Mining and Technology, Xuzhou 221116, China bState Key Laboratory of Coal Resource and Mining Safety, Xuzhou 221008, China cSchool of Mining .
The purpose of this research is to study the effect of longwall mining on the stability of main roadway in the underground coal mine. The PT GDM (Gerbang Daya Mandiri) underground coal mine in Indonesia, where the rocks are weak, was selected as a representative study site. To accomplish the objective of the research, the finite difference code software FLAC3D was used as a tool for the ...
The top coal caving with vibration technique has a higher coal recovery ratio. This technique improves the top coal broken effect and lowers the waste content rate. The significant economic and social benefits proved it to be a promising technique.
In view of the damage of dynamic stress to the rock surrounding a mine roadway during coal mining, based on the actual geological conditions of Zhuji mine in Huainan, China, a UDEC model was established to study the influences of the thickness and strength of the direct roof above the coal seam and the anchorage effect on the stability of the roadway.
Procedia Earth and Planetary Science 1 (2009) 219–226 The 6th International Conference on Mining Science Technology Technique of top coal caving with vibration Xie Yaoshea,b,*, Zhao Yangshengc aSchool of Mines, China University of Mining and Technology, Xuzhou 221116, China bState Key Laboratory of Coal Resource and Mining Safety, Xuzhou 221008, China
Longwall Top Coal Caving (LTCC) Mining Technology. Not all the coal would be recovered, but recoveries of 7580% of the full seam in the block are achievable. The system also allows the initial mining height to be reduced to a preferred working height without losing coal. The Top Coal Caving is a Modified Longwall Mining system.
Based on three typical mining layouts,, protective coalseam, topcoal caving and nonpillar mining, the coal mining process at a depth of 1000 m was simulated through mechanical tests on a laboratory scale, and simultaneous AE localization of this process was carried out to study the AE characteristics under deep coal mining conditions.
Extraction of mineral resources is the backbone of the national economy in many developed and developing countries of the world. However, the exploitation can have many negative impacts on the immediate environment of the exploitation sites. In this study performed on some mining areas of the Moroccan AntiAtlas, four principal negative effects were detected: effect on the physiognomy, on ...
Coal mining Coal mining Choosing a mining method: The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in extracting a coal seam depends on many .
Apr 30, 2015· has extensive experience in the design of roof supports for specific mining conditions. Cat Longwall Top Coal Caving (LTCC) roof supports allow mining of seams seams thicker than 6 ...
Oct 10, 2018· In recent years, rockbursts have occurred frequently during the mining of thick coal seams in China. Use of the topcoal 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.
This paper studies the arching phenomenon in topcoal caving mining process of ultrathick coal seam. A series of laboratory granular material simulation experiments were performing and a topcoal arching model in the framework of mechanics was established to explore the formation characteristic of arches and their effects to topcoal loss.
Oct 10, 2018· Comparison of rockburst occurrence during extraction of thick coal seams using topcoal caving versus slicing mining methods. Zhenlei Li, a b Xueqiu He, a c Linming Dou, b Dazhao Song a c. a School of Civil and Resources Engineering, University of .
A fully mechanized topcoal caving mining method is a main underground coal extraction method for ultrathick coal seams. ... The experimental results demonstrated that the vibration effect range ...
The coal seam mininginduced characteristics of overlying strata fracture and surface subsidence are tested and numerically analyzed using the similar materials. Two mining models were conducted in a laboratory with two different rock orientations and slopes to simulate the stability conditions and driving conditions of the loess land slope of under the guides of the Vshaped law.
Sep 24, 2018· This paper presents a comprehensive analysis of roof strata conditions, shield pressure, and ground surface subsidence above Panel 42105 of the Buertai Coal Mine in Inner Mongolia, China. A 3D geological model and a 2D numerical simulation model are established to examine the roof strata structures with varying strata conditions. Numerical simulation results demonstrate that the hard rock 1 ...
Feb 19, 2014· LTCC with vibrator The vibrator destroys the arch structure formed during the top coal caving process, which results in the smooth top coal caving process, and in this way the top coal recovery ratio is increased. 10. LTCC with vibrator Support Yield beam Vibration device 11. Advantages of LTCC • • • • • High resource recovery .
A brief description of longwall top coal caving (LTCC) is included at the end of the Longwall section of the Fundamentals of Coal Mining module of this web site. Despite the fact that there are numerous coal seams in Australia which are thick enough for LTCC to be used to increase recoveries, potentially at a reduced cost/tonne, there has been ...
The article discussed the advantages and disadvantages of the traditional long wall top coal caving (LTCC) first, then proposed a new technique of top coal caving with vibration. The theoretical basis of the technique was top coal vibration system and its control system have been designed as such when the system works, the emulsion pump station provides power for whole system ...
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