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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 .
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.
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.
The mechanism of rockburst in SIETCS for fully mechanized topcoal caving mining under gob filling conditions was proposed,, "high compressive stress concentration plus breakage of the suspended roofinduced stress" rockburst, and this is further verified by ground destruction, microseismic (MS) monitoring and numerical modeling.
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 provides a novel rockcoal interface recognition method based on stacked sparse autoencoders (SSAE). Given their different size and hardness, coal and rock generate different tail beam vibrations. Therefore, the rockcoal interface in top coal caving can be identified using an acceleration sensor to measure such vibrations. The end of the hydraulic support beam is an ideal location ...
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.
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.
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 .
Jul 22, 2020· ☑ High Mining Height Mining, Top Coal Caving Mining, Fully Mechanized Mining Our exploration specialists acutely ascertain the significant aspects of the global Powered Support market report. It also provides an indepth valuation in regards to the future advancements relying on the past data and present circumstance of Powered Support market ...
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 Top Coal Caving is a Modified Longwall Mining system Equipment Selection of Longwall Top Coal Caving Mining The space behind the rear legs of the powered supports is large enough to allow lateral and vertical movements other goaf shield for control of caving. Get Price.
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 ...
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.
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.
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 ...
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
Introduction. In China, coal is the main energy source, accounting for about 70% of primary energy production and consumption 1, top coal caving mining method has the advantage of highproduction, highefficiency, low development ratio, and lowcoast, it has developed rapidly in the past two decades and become the most extensively used mining method in China 3 – 7.
Apr 30, 2015· has extensive experience in the design of roof supports for specific mining conditions. Longwall Top Coal Caving (LTCC) roof supports allow mining of seams seams thicker than 6 ...
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
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 .
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.
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 .
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.
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