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Based on three typical mining layouts, i.e., protective coal-seam, top-coal 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.
A fully mechanized top-coal caving mining method is a main underground coal extraction method for ultra-thick coal seams. ... The experimental results demonstrated that the vibration effect range ...
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 .
The coal seam mining-induced 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 V-shaped law.
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 ...
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.
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 Yao-shea,b,*, Zhao Yang-shengc 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 75-80% 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.
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 ...
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 Anti-Atlas, four principal negative effects were detected: effect on the physiognomy, on ...
Introduction. In China, coal is the main energy source, accounting for about 70% of primary energy production and consumption 1, 2.Since top coal caving mining method has the advantage of high-production, high-efficiency, low development ratio, and low-coast, it has developed rapidly in the past two decades and become the most extensively used mining method in China 3 – 7.
This paper provides a novel rock-coal 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 rock-coal 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 ...
This paper studies the arching phenomenon in top-coal caving mining process of ultra-thick coal seam. A series of laboratory granular material simulation experiments were performing and a top-coal arching model in the framework of mechanics was established to explore the formation characteristic of arches and their effects to top-coal 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 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.
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 Yao-shea,b,*, Zhao Yang-shengc 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 .
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.
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 Yao-shea,b,*, Zhao Yang-shengc 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.
The average coal seam thickness was approximately 15.3 m. Fully mechanized top-coal 89 caving mining method was employed. The coal was cut to a height of 3.9 m while the top coal caving 90 height averaged 11.4 m. ZF/15000/27.5/42 hydraulic supports were used. No.5404 and No.5105
mechanized top-coal caving mining, which not only affects the recovery of top-coal, but also affects the quality of the coal. This paper studies the arching phenomenon in top-coal caving mining process of ultra-thick coal seam. A series of laboratory granular material simulation experiments were
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 elaborated.The 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 ...
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 in-depth valuation in regards to the future advancements relying on the past data and present circumstance of Powered Support market ...
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