采矿与安全工程学报2011，Vol.28Issue(2)：247-251,5.
块度对顶煤放出率影响的数值模拟分析
Numerical Simulation of the Effect of Particle Size on Coal Caving Ratio
摘要
Abstract
We study the effect of particle sizes on coal caving ratio and simulate the caving regularity of loose top-coal with different particle sizes using the PFC2D software and the mechanics of granular media. The result shows that there exists a critical value of the particle size of the top-coal. If this value is smaller than the critical one, the coal caving ratio is comparatively higher, otherwise, the coal caving ratio drops dramatically. The arch-forming of coal and gangue and their relative motion are main factors affecting the loss of caving coal. The criterion of the probability KL and Kc of arch-forming and of the stability of boundary between top-coal and gangues is obtained. Reducing the size of particles, enlarging the size of the drawing coal window, improving the stability of the boundary between top-coal and gangues, and trying not to disturb the boundary are applicable methods to increase the coal caving ratio.关键词
块度/放出率/PFC2D/散体Key words
particle size/ coal caving rate/ PFC2D/ discrete element分类
矿业与冶金引用本文复制引用
张勇,司艳龙,石亮..块度对顶煤放出率影响的数值模拟分析[J].采矿与安全工程学报,2011,28(2):247-251,5.基金项目
国家自然科学基金项目(50974123) （50974123）
国家"十一五"科技支撑计划项目(2008BAB36B01) （2008BAB36B01）
