Abstract:

The UDEC numerical simulating was used to study roof movement laws under different conditions such as different coal thickness ,dip angle and length of workface under the engineering background of steep coal seam workface in Xinqiang Coal Mine. The research shows that the range of overburden’s destruction is mainly on the up and middle of goal. Because of slide instability the upper roof make tensile fracture and the phenomenon of floor heave is serious. The overburden move will become more severe when adding coal seam dip angle, thickness and workface length. The coal seam dip angle is the most important one among all the factors. This research achievement possesses theoretical guiding significance for the stability of surrounding rock and support system on steep coal seam workface.

Key words: deeply inclined coal seam, numerical simulating, roof movement laws