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Numerical investigation on the caving mechanism with different standard deviations of top coal block size in LTCC

International Journal of Mining Science and Technology 2020年第5期30卷 583-591页

作者： Jiachen Wang Weijie Wei Jinwang Zhang Brijes Mishra Ang Li State Key Laboratory coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China coal Industry Engineering Research Center of top-coal Caving Mining Beijing 100083China Department of Mining Engineering West Virginia UniversityMorgantownWV 26505USA

The size distribution of the broken top coal blocks is an important factor,affecting the recovery ratio and the efficiency of drawing top coal in longwall top coal caving(LTCC)mining *** standard deviation of top coal block size(dt)is one of the main parameters to reflect the size distribution of top *** find the effect of dt on the caving mechanism,this study simulates experiments with 9 different dt by using discrete element software *** dt is divided into two stages:uniform distribution stage(UDS)whose dt is less than 0.1(Schemes 1–5),and nonuniform distribution stage(NDS)whose dt is more than 0.1(Schemes 6–9).This research mainly investigates the variation of recovery ratio,drawing body shape,boundary of top coal,and contact force between particles in the two stages,*** results showed that with the increasing dt,the recovery ratio of the panel increases first and then decreases in *** is the largest in Scheme 3,which mainly increases the drawing volume at the side of starting drawing ***,the recovery ratio decreases first and then increases quickly in NDS,and it is the largest in Scheme 9,where the drawing volume at the side of finishing drawing end are relatively *** UDS,the major size of top coal is basically medium,while in NDS,the size varies from medium to small,and then to large,with a distinct difference in shape and volume of the drawing *** the major size of top coal is medium and small,the cross-section width of the initial boundary of top coal at each height is relatively ***,when the top coal size is large,the initial boundary of top coal has a larger opening range,the rotating angle of lower boundary is relatively small in the normal drawing stage,which is conducive to the development of drawing body and reduces the residual top coal,and the maximum particle velocity and the particles movement angle are both *** study lays a foundation for the prediction of recovery ratio,and sug

关键词： Longwall top coal caving mining Standard deviation of top coal size Recovery ratio Drawing body boundary of top coal Contact force

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