It can increase the recovery rate of coal resources through using the spalling rib and reducing slide falling accidents,the implementation of the integrated management of natural gas,accelerating mining degrees.

According to the actual situation of rib spalling in high caving face in Sihe Coal Mine,after the mechanical analyzing,this article discussed the mechanism of rib spalling,the factors which affected the spalling,and the prevention and cure measure.

Through observing and analyzing to roof and wall of spot in 6114 workface,this paper sum up rules and features of rib spalling and roof fall under complicated geology condition in sub-level caving mining workface,it raises a series of roof control measures and gets good result.

The characters, damage and cause of rib fall at blasting face were analysed, and preventive measures were put forward, which has some reference value for other similar condition mines.