Active Prefracture Methods Top Coal Caving Technologies for Thick Gently Dipping Seams
V. I. Klishin1, G. Yu. Opruk1, L. D. Pavlova2, V. N. Fryanov2
1Institute of Coal, Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, 650065 Russia
2Siberian State Industrial University, Novokuznetsk, 654007 Russia
Keywords: Угольный пласт, подкровельная толща, напряжения, дозирование горной массы, предразрушение, численное моделирование, Coal seam, roof rocks, stresses, rock mass proportioning, prefracture, numerical modeling
Abstract
The authors perform numerical modeling for the comprehensive stress-strain analysis of roof rocks above powered roof support units in the longwall top coal caving technology. Passive control of top coal prefracture fails to maintain efficient disintegration and well-proportioned flow feed on armoured face conveyor. The relations between the residual and initial strength of coal and the prop of the powered roof support units at different combinations of methods and means of active control are obtained; their ranges of application and the proportioned flow rates are determined.
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