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Application of the Vibration to the Top Coal Caving

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.

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(PDF) Application of Vibration in Longwall Top Coal Caving ...

Top-coal caving technology is widely used for thick coal-seam mining in China. This paper introduces a top-coal caving method with vibration. This is a technology that has been developed in order ...

More

Application of the Vibration to the Top Coal Caving ...

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 ...

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(PDF) Technique of top coal caving with vibration

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 ...

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Numerical simulation of the top coal caving process using ...

How to understand the top coal caving process and increase the top coal recovery ratio is one of the urgent problems to resolve for longwall top coal caving technology. This paper discusses a new theory and technology of top coal caving with vibration. The vibration device is mounted on the shield beam of the top coal caving support.

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Force chains in top coal caving mining - ScienceDirect

2020-3-1  Jiang 7 postulated the roof strata as a kind of arching structure above the top coal caving mining face. The effect of fracture and movement of main roof on the mining face was weakened due to the existence of top coal. In front of the mining face, the physical status of top coal transits from continuous to quasi-continuous and to discrete medium.

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Force chains in top coal caving mining Request PDF

Top coal caving mining destroyed the equilibrium of the initial force chain network. Force chains developed and grew in the overlying strata in an arch-like form over the mining area, which ...

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Effect of Key Parameters on Top Coal First Caving and

The first caving of top coal and the first weighting of roof strata in Longwall Top Coal Caving (LTCC) mining were analyzed in a parametric study by using a discontinuum modeling technique with plastic rock material. The analysis demonstrated that ...

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Effect of upward angle on the drawing mechanism in ...

The longwall top coal caving (LTCC) is an efficient mining method to specifically extract thick or ultra-thick coal seams due to its good adaptability with respect to the large variations of coal ...

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张锦旺 副教授-能源与矿业学院 - cumtb.cn

2020-5-27  Effect of face dip angle on the drawing mechanism in longwall top-coal caving mining. Journal of China University of Mining and Technology. 2018, 47(4): 805-814 (doi: 10.13247/j.cnki.jcumt.000889) (9) Wang JC, Zhang JW. BBR study of top-coal drawing law in

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Application of the Vibration to the Top Coal Caving

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.

More

(PDF) Application of Vibration in Longwall Top Coal Caving ...

Top-coal caving technology is widely used for thick coal-seam mining in China. This paper introduces a top-coal caving method with vibration. This is a technology that has been developed in order ...

More

(PDF) Technique of top coal caving with vibration

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 ...

More

Application of the Vibration to the Top Coal Caving ...

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 ...

More

Study on Metal Plate Vibration Response Under

2019-4-19  Longwall top coal caving (LTCC) [] is the main modern fully mechanized coal mining equipment in the thick seam mining of china, as shown in Fig. 1, which consists of the scraper conveyor, coal shearer and hydraulic powered support [].LTCC support is the major supporting equipment [].There exists a collision when the coal–gangue crashes into the metal plate of the shield beam or tail boom in ...

More

Joint Dedusting and Enhancement of Top-Coal Caving

2021-9-11  Affected by the uneven concentration of coal dust and low illumination, most of the images captured in the top-coal caving face have low definition, high haze and serious noise. In order to improve the visual effect of underground images captured in the top-coal caving face, a novel single-channel Retinex dedusting algorithm with frequency domain prior information is proposed to solve the ...

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Effect of Key Parameters on Top Coal First Caving and

The first caving of top coal and the first weighting of roof strata in Longwall Top Coal Caving (LTCC) mining were analyzed in a parametric study by using a discontinuum modeling technique with plastic rock material. The analysis demonstrated that ...

More

Effect of Face Length in Initial Mining Stage of Fully ...

2021-7-1  Underground mining of thick coal layers with a thickness of more than 4.5 m has operational, technical, safety and economic problems. When the mining height exceeds 5.0 m, it is difficult to optimize the productivity and control surface stability due to the limitation of equipment design and surface conditions (Hebblewhite et al. 2002, 2013).Top caving coal mining provides a method that can ...

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Effect of upward angle on the drawing mechanism in ...

The longwall top coal caving (LTCC) is an efficient mining method to specifically extract thick or ultra-thick coal seams due to its good adaptability with respect to the large variations of coal ...

More

专家详情_土木与资源工程学院 - USTB

13. Zhengyang Song*, Heinz Konietzky A particle-based numerical investigation on longwall top coal caving mining, Arabian Journal of Geoscience. 2019. (If=1.327) SCI. 14. Zhengyang Song, Weijie Wei, Jinwang Zhang. Numerical investigation of effect of particle

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Application of the Vibration to the Top Coal Caving

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.

More

(PDF) Technique of top coal caving with vibration

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 ...

More

Application of the Vibration to the Top Coal Caving ...

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 ...

More

Study on Metal Plate Vibration Response Under

2019-4-19  Longwall top coal caving (LTCC) [] is the main modern fully mechanized coal mining equipment in the thick seam mining of china, as shown in Fig. 1, which consists of the scraper conveyor, coal shearer and hydraulic powered support [].LTCC support is the major supporting equipment [].There exists a collision when the coal–gangue crashes into the metal plate of the shield beam or tail boom in ...

More

An acoustic wave method for evaluating the effectiveness ...

2021-11-3  1 INTRODUCTION. Longwall top coal caving (LTCC) mining is the most efficient method to extract thick or extra-thick coal seam and extensively used in western China. 1-5 With high productivity and efficiency, LTCC mining plays an ultimate important role in the development and reform of the traditional coal mining method. The prototype of LTCC could date back to the 1960s and 1970s, when

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Joint Dedusting and Enhancement of Top-Coal Caving

2021-9-11  Affected by the uneven concentration of coal dust and low illumination, most of the images captured in the top-coal caving face have low definition, high haze and serious noise. In order to improve the visual effect of underground images captured in the top-coal caving face, a novel single-channel Retinex dedusting algorithm with frequency domain prior information is proposed to solve the ...

More

Effect of Face Length in Initial Mining Stage of Fully ...

2021-7-1  Underground mining of thick coal layers with a thickness of more than 4.5 m has operational, technical, safety and economic problems. When the mining height exceeds 5.0 m, it is difficult to optimize the productivity and control surface stability due to the limitation of equipment design and surface conditions (Hebblewhite et al. 2002, 2013).Top caving coal mining provides a method that can ...

More

Dynamic Random Arching in the Flow Field of Top-Coal ...

The large mining height fully mechanized top-coal caving mining technique has developed rapidly and become the most extensively used mining method for ultra-thick coal seams. The arching of coal/gangue and the drawing out of gangue are peculiar phenomena in the process of fully mechanized top-coal caving mining, which not only affects the recovery of top-coal, but also affects the quality of ...

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Top Coal Caving Longwall underground COAL

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

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Study on the abutment pressure distribution in top coal

2020-2-6  Since 1982, the longwall top coal caving technique has been widely used in China as an advanced underground coal mining method with high output and high efficiency (Unver and Yasitli 2006; Wei et al. 2017; Zhu et al. 2018).The deformation and failure of top coal is one of the most important issues for the new mining technique.

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