Study of mechanical principle of floor heave of roadway driving along next goaf in fully mechanized sub-level caving face

摘要

On the basis of analyzing floor strata mechanical circumstance of the roadway, the me- chanical model was established. The relative displacement of roadway floor, narrow pillar floor coal mass and floor strata was calculated, the results showed that the high abutment pressure on coal mass beside the roadway was the main reason to lead to relative displacement of floor stra- ta.