采矿与安全工程学报Issue(2)：208-213,6.
顶煤成拱机理的数值模拟研究
Numerical simulation on top-coal arching mechanism
摘要
Abstract
By analyzing the broken, caving characteristics and motion criterion of top coal and imme-diate roof behind the shield, the discrete element numerical simulation model for top coal was estab-lished in this paper. Meanwhile, from the moving characteristics of coal-rock blocks and evolvement rules of contact force, the top-coal arching mechanism behind shield was discussed. The kinematic mechanism of top coal arching is that there exits a high-speed area of top coal above the coal draw-point, and the moving speeds of coal-rock blocks on the two sides of high-speed area are smaller. The top coal silts at both sides of the coal draw-point, and develops unstable contact force arching above the coal draw-point, which can result in moving speed of top coal near the coal draw-point decreasing. When large-scale top coal blocks in the higher level surge up to the coal draw-point, they can be easily squeezed and form an arch in mining process. The mechanics mechanism of top coal arching is that the drawing process of granular top coal can be seen as a formation and destruction process of the contact force arch. When the upper contact pressure is greater than the frictional resistance formed by the arch-ing extrusion blocks, the contact force arch may damage, otherwise the stable contact force arch appears, and the coal draw-point may be jammed. Field measurements have verified the theoretical analysis.关键词
放顶煤/成拱机理/数值模拟/现场观测Key words
top-coal caving/arching mechanism/numerical simulation/field measurement分类
矿业与冶金引用本文复制引用
白庆升,屠世浩,王沉..顶煤成拱机理的数值模拟研究[J].采矿与安全工程学报,2014,(2):208-213,6.基金项目
江苏省高校优势学科建设工程资助项目(SZBF2011-6-B35)；江苏省研究生培养创新工程项目(CXZZ13_0948)；中央高校基本科研业务费专项资金资助项目(2012LWB42) （SZBF2011-6-B35）
