Based on theory analysis and practical survey in testing ground,had studied influence factors such as caving height,work resistance of supports,coal seam rupture angle,main roof rotary angle and stopping mining time.

A calculation method of the failure zone width of side coal-wall of roadway in seams;

The prevention of quake produced by coal and rock break is a worldwide problem.

In the light of the fragmentized coal body in 2315 comprehensive mechanical coal mining face of Chengzhuang Coal Mine, this paper applies the grouting solidifying technology with Malisan N to solve successfully the difficulties existing in the ceiling management in the stoping process.

In the light of the hidden dangers existing in the back production of comprehensive mechanized coal mining face, this paper advances the scheme of reinforcing the fragmentized coal body around the geological structure to assure the smooth completion of the back production of coal mining face.