ABSTRACT
In this study, the roof-caving process of a 3207 fully mechanized large-cutting-height face is analyzed by calculating each bed load, the first caving step distance, the periodic caving step distance, and the other parameters of the 3207 fully mechanized large-cutting-height face roof and analyzing periodic weighting of the working face combining with the observed data. Test results show that: (1) the way of roof caving at mined-out areas of the 3207 working face is layer caving each time; (2) the pace of direct top collapsing initially is 14.1-16.0 m, the pace of basic top collapsing initially is 27.0-29.8 m, the cycle collapsing initially is about 11.0 m; and (3) the periodic roof weighting pace of the basic top decreases with increasing day advance progress, the difference of the periodic weighting distance among the upper, middle, and lower working faces is not big, but the middle dynamic load factor is 1.60, which shows a high weighting intensity This study provides a basis for mining pressure control and safety mining of a 3207 fully mechanized large-cutting-height face.
