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A discontinuum modelling approach for investigation of Longwall Top Coal Caving mechanisms
International Journal of Rock Mechanics and Minings Sciences, 2018 This paper presents a discontinuum modelling approach to investigate Longwall Top Coal Caving (LTCC) behaviour including stress distribution, coal and rock failures, top coal caving and roof strata rupture, and to analyse the impact of overburden ...
Associate Professor Chengguo Zhang +2 more
exaly +2 more sources
International Journal of Rock Mechanics and Minings Sciences, 2019 In order to investigate top-coal drawing regularity and automated top-coal caving technology in extra-thick coal seams, an approach coupling the particle element and the block element is presented based on the continuum-discontinuum element method (CDEM).
Jinchao Yue, Qunlei Zhang
exaly +2 more sources
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Arabian Journal of Geosciences, 2018
A good understanding of the caving mechanisms of loose top-coal is significant for longwall top-coal caving (LTCC) mining. In this paper, the equations of the particle motion, top-coal boundary, and drawing body were derived based on the stochastic medium theory. Then, the particles moving boundary and the shape of the top-coal loss were discussed, and
Dijie Zhu +4 more
openaire +1 more source
A good understanding of the caving mechanisms of loose top-coal is significant for longwall top-coal caving (LTCC) mining. In this paper, the equations of the particle motion, top-coal boundary, and drawing body were derived based on the stochastic medium theory. Then, the particles moving boundary and the shape of the top-coal loss were discussed, and
Dijie Zhu +4 more
openaire +1 more source
Application of fractal theory to top-coal caving
Chaos, Solitons & Fractals, 2008Abstract The experiences of underground coal mining in China show that coal in a thick hard coal seam with a hard roof, the so-called “double hard coal seam”, is difficult to be excavated by top-coal caving technique. In order to solve the problem, a top-coal weakening technique is proposed in this paper.
H. Xie, H.W. Zhou
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Longwall Top Coal Caving Mechanisms in the Fractured Thick Coal Seam
International Journal of Geomechanics, 2020Abstract In this study, the finite difference method (FDM) coupled with a discrete fracture network (DFN) was utilized to analyze longwall top coal caving (LTCC) behaviors.
Jiachen Wang, Zhaohui Wang, Yang Li
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Theoretical equation of initial top-coal boundary in longwall top-coal caving mining
International Journal of Mining and Mineral Engineering, 2018The theoretical equation of initial top-coal boundary (ITCB) is one of the fundamental problems of top-coal drawing law in longwall top-coal caving (LTCC) mining. The granular mechanical model of ITCB is established based on loose medium flow field theory.
jie Wei, Zhengyang Song, Jinwang Zhang
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Mining Technology, 2006
Underground coal production at GLE Turkey was originally won from conventional longwall mining (drill and blast) and more recently from the innovative use of the mechanised longwall top coal caving method. This latter method was introduced to gain maximum tonnage from the extraction of an 8 m lignite coal seam under very difficult mining conditions ...
Ediz, I. Göktay +3 more
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Underground coal production at GLE Turkey was originally won from conventional longwall mining (drill and blast) and more recently from the innovative use of the mechanised longwall top coal caving method. This latter method was introduced to gain maximum tonnage from the extraction of an 8 m lignite coal seam under very difficult mining conditions ...
Ediz, I. Göktay +3 more
openaire +2 more sources
Study on the abutment pressure distribution in top coal caving
Arabian Journal of Geosciences, 2020The investigation on the deformation and failure of top coal and its roof strata is the key topic of fundamental research of the fully mechanized top coal caving method. In this paper, the mechanical model of continuous damage and failure of top coal is established based on damage mechanics and statistical strength theory.
Bin Yu, Lingfan Zhang
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Evaluation of Top Coal Yielding Potential in Longwall All Top Coal Caving Mining
2014Longwall Top Coal Caving (LTCC) is a method of extraction for underground mining of thick coal seams. This method, being a combined version of Longwall and Sublevel caving methods, has a higher output than a single longwall face. This is because coal is not only extracted by shearer loader but also produced by simultaneous caving of the remaining top ...
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Analysis of the dialectical relation between top coal caving and coal-gas outburst
Journal of Coal Science and Engineering (China), 2009According to the different engineering mechanical states of top coal caving and normal stoping of gaseous loose thick coal seams, the dialectical relation between this caving method and dynamic disasters was analyzed by simulating the change of stress states in the process of top coal initial caving with different mining and caving ratios based on the ...
Xian-zheng Meng +3 more
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