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Numerical simulation study on the mining pressure law and collaborative failure of soft-hard interlayer working face. [PDF]

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Hou Z, Li H, Liu G, Xie K, Wu P, Yang Z.
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Caving mechanisms of loose top-coal in longwall top-coal caving mining method

International Journal of Rock Mechanics and Mining Sciences, 2014
Abstract The top-coal caving mining method, developed steadily in the past two decades, has become the main method for thick seam coal mining in China. In recent years, the core research areas in the top-coal caving mining are the mechanisms of top-coal caving and the improvement of top-coal recovery ratio.
Jiachen Wang, Shengli Yang, Yang Li, Like Wei, Haohao Liu   +4 more
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Drawing mechanism of fractured top coal in longwall top coal caving

International Journal of Rock Mechanics and Mining Sciences, 2020
Abstract This work proposed a progressive-sectional failure model (PSFM) based on Particle Flow Code (PFC) to simulate top coal drawing process in longwall top coal caving (LTCC) mining. The progressive-sectional fracturing of top coal was reproduced in simulation.
Zhengyang Song, Heinz Konietzky, Martin Herbst   +2 more
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Modeling Top Coal Disintegration in Thick Seams in Longwall Top Coal Caving

Journal of Mining Science, 2019
The geomechanical model of the powered roof support-top coal-roof rock system is developed. For investigation of disintegration processes in top coal of thick seam, numerical modeling with finite element discretization of a study domain is carried out using the authors’ original code.
V. I. Klishin, V. N. Fryanov, L. D. Pavlova, G. Yu. Opruk   +3 more
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Force chains in top coal caving mining

International Journal of Rock Mechanics and Mining Sciences, 2020
Abstract During the top coal caving mining, rock mass becomes fractured, and the physical status of top coal and overlying strata in the vicinity of the working face changes from continuous to discontinuous medium. It is considerably difficult to explain in theory the transition and action of mining-induced pressure in discrete top coal and fractured
Jin-an Wang, Liu Yang, Fei Li, Chao Wang
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Caving mechanisms of loose top-coal in longwall top-coal caving mining based on stochastic medium theory

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, Zhonghui Chen, Weisheng Du, Lingfan Zhang, Zihan Zhou   +4 more
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Stress analysis of longwall top coal caving

International Journal of Rock Mechanics and Mining Sciences, 2010
Longwall top coal caving (LTCC) is a relatively new method of mining thick coal seams that is currently achieving high productivity and efficiency in application, particularly in China. The technique is similar to traditional longwall mining in that a cutting head slices coal from the lower section of the coal seam onto a conveyor belt installed in ...
Alehossein, Habib, Poulsen, Brett A.
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Theoretical equation of initial top-coal boundary in longwall top-coal caving mining

International Journal of Mining and Mineral Engineering, 2018
The 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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Longwall Top Coal Caving Mechanisms in the Fractured Thick Coal Seam

International Journal of Geomechanics, 2020
Abstract 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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Effect of Key Parameters on Top Coal First Caving and Roof First Weighting in Longwall Top Coal Caving: A Case Study

International Journal of Geomechanics, 2020
Abstract 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...
Tien Dung Le, Xuan Nam Bui
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