MODELING ARCHING of ROCKS in TOP COAL CAVING in THICK and GENTLY DIPPING COAL SEAMS
A. N. Starodubov1,2, V. I. Klishin1,2, A. N. Kadochigova1, A. V. Kaplun3
1Federal Research Center for Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia
2Gorbachev Kuzbass State Technical University, Kemerovo, Russia
Keywords: Numerical modeling, underground mining, top coal caving, arching, powered roof support, discrete element methods, arches, outlet hole
Abstract
The process of rock arching in top coal caving with powered roof support systems is investigated. A direct proportional dependence between top coal flow duration and probability of static arching of rocks above an outlet hole, which prevents caving, is revealed. The new-developed method allows more accurate determination of the conditions and zones of rock arching in a model with one unit of powered roof support. When a number of powered roof support units operate in simultaneous top coal caving, the probability of arching may reduce greatly owing to the creation of a common zone of top coal flow.
|
