Abstract: By using the in-situ observation and numerical simulation, the roof moving features of fully-mechanized sublevel caving face with deep alluvium has been studied. The results can be drawn as follows: 1) The time effect of the load of supports in the fully mechanized caving face with deep alluvium is significant. 2) While with advance of working face, the break of the immediate roof forms “rock-gangue” structure periodically and the break of the basic roof induces weighting of working face. 3) The weighting order along incline direction of the working face follows roof fracture characteristics of general working face. 4) The area of overlying strata area to be controlled by supports is large, and the strength of weighting induced by the upper basic roof breaking is large. 5) The advance stress fluctuation monitoring technology offers a new method for weighting prediction in working face. Finally, the suggestion about roof accident prevention of fully-mechanized sublevel caving face with deep alluvium was proposed. The study results can be useful for roof control design and roof accidents prevention in fully-mechanized sublevel caving face with deep alluvium.

Key words: fully-mechanized sublevel caving face, roof movement, deep alluvium, in-situ observation, numerical analysis