Application of retreating and caving longwall (top coal caving) method for coal production at GLE Turkey

Ediz, I. Göktay; Dixon-Hardy, Darron; Akçakoca, Hamdi; Aykul, H.

doi:10.1179/174328606x103586

Cited by 10 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high-reach single-pass longwall used in Australia has been successful, but the cutting height is limited to less than 4.8 m with current equipment. To increase the recovery of Australian thick seam reserves, the LTCC mining technology is providing an alternative solution to economic underground thick seam mining in Australia [24][25][26][27]. The conceptual model of longwall top coal caving (LTCC) is shown in Figure 4.…”

Section: Longwall Top Coal Cavingmentioning

confidence: 99%

Underground Coal Mining Methods and Their Impact on Safety

Vinay¹,

Bhattacharjee²,

Ghosh³

2023

Natural Hazards - New Insights

View full text Add to dashboard Cite

In underground coal mining, the working environment is completely enclosed by the geologic medium, which consists of the coal seam and overlying and underlying strata. Depillaring is one of the most dangerous phases of underground coal mining. Even after centuries of experience in underground coal mining, there is no well-established depillaring method w.r.t existing geo-mining method. As far as fatal accidents are concerned, most of the fatal accidents occur mostly during depillaring operations. Method of extraction is one of the keys and underrated parameters, which plays an eminent role in successful depillaring in underground coal mining. This chapter highlights the underground coal mining methods and their impact on safety.

show abstract

Section: Longwall Top Coal Cavingmentioning

confidence: 99%

Underground Coal Mining Methods and Their Impact on Safety

Vinay¹,

Bhattacharjee²,

Ghosh³

2023

Natural Hazards - New Insights

View full text Add to dashboard Cite

show abstract

“…In China, LTCC began in the 1980s but developed rapidly. At present, LTCC has gradually become the most popular method for mining thick or extra-thick coal seams [1][2] [3], and China is in the leading position in the world in studying automated LTCC technology [4] [5] [6]. In traditional top-coal mining technology, the drawing process is observed by workers through a gap between hydraulic supports.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of reasonable cycle step length for longwall topcoal drawing in extra-thick coal seams based on the particle-block element coupling approach

Wang¹

2023

IJLEMR

View full text Add to dashboard Cite

The cycle step length (CSL) is a significant parameter for longwall top-coal drawing technology that remarkably affects the top-coal recovery rate and the rock-mixing rate, especially for extra-thick coal seams. In this study, a particle-block element coupling approach is performed to investigate a reasonable CSL for extrathick coal seams. By comparing this approach to the Bergmark-Roos analytical result, the proposed numerical model is verified, showing good performance in modeling top-coal caving. A 2-D numerical model of hydraulic support considering the mechanical behavior of the legs is established, which can be used for modeling the interaction between the hydraulic support and the top coals during the top-coal drawing process. The top-coal recovery rate, the top-coal drawing body shape, and the evolution characteristics of the coal-rock interface under different CSL conditions are compared. In addition, the mechanism of the lost top coal affected by the CSL is revealed. The results show that the CSL of top-coal drawing has a significant effect on the morphology of the coal-rock interface and the mutual invasion of coal and rock, which is the primary reason for coal loss and further affects the top-coal recovery rate and the rock-mixing rate. It is suggested that the CSL should be 0.8 m when the top-coal thickness is 12 m.

show abstract

“…Meanwhile, according to China's primary energy consumption structure prognostic figure Figure 2 [6,18], coal proportion by 2030 will continue to account for more than 60 percent, and it will maintain its dominant position that is irreplaceable for a long time. Moreover, as the important technology of coal mining and the key technology of thick coal seam mining, the study of the top coal caving technology [19][20][21][22] is of great significance to improve the mining efficiency and realize the digital mine construction.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Analysis of the Coal Gangue‐like Elastic Rock Sphere Impact on the Massless Tail Beam Based on Contact‐Structure Theory and FEM

Yang

Wan

Xin

2019

Shock and Vibration

View full text Add to dashboard Cite

The impact and collision behavior between the coal gangue and the hydraulic support widely exists in the top coal caving. However, due to the complex interactions between the large number of coal gangue particles in the mining surface and the limitations of the coal mining technology and other factors, it becomes a difficult problem to study the collision behavior and the contact response between the coal gangue and the hydraulic support or its main components under the actual caving conditions. In order to accurately grasp the contact response law when the coal gangue impacts the tail beam of the hydraulic support, in combination with the equivalent stiffness of the tail beam jack, the Lankarani–Nikravesh (L-N) nonlinear spring-damping contact model, the structural mechanics model of the tail beam, and the energy conservation law, this paper firstly establishes the system contact-structure dynamic model when the particles impact on the tail beam based on the tail beam equivalent kinematics model. Then, to further study the system contact response, the spring damper module is used in the finite element software for the first time to replace the hydraulic cylinder, and four different types of the rigid-flexible coupling simulations when the impact heights, the impact positions, the rock radii, and the rock materials change are conducted, respectively. Through the combination of the theory and the simulation, the contact response law when the particles impacting the massless tail beam under different working conditions is obtained, and the system contact response differences as well as the coal gangue identifying feasibility on the basis of the response differences after the coal gangue impact are analyzed. The conclusions will provide theoretical reference and simulation method for the study of the impact-contact behavior between the coal gangue and the hydraulic support.

show abstract

Application of retreating and caving longwall (top coal caving) method for coal production at GLE Turkey

Cited by 10 publications

References 1 publication

Underground Coal Mining Methods and Their Impact on Safety

Underground Coal Mining Methods and Their Impact on Safety

Numerical study of reasonable cycle step length for longwall topcoal drawing in extra-thick coal seams based on the particle-block element coupling approach

Dynamic Response Analysis of the Coal Gangue‐like Elastic Rock Sphere Impact on the Massless Tail Beam Based on Contact‐Structure Theory and FEM

Contact Info

Product

Resources

About