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.

With the chemical grouting and reinforced technology for the coal and rock masses,the stability of the coal and rock mass was improved and the roof accidents due to the coal wall spalling was eliminated,which had ensured the successful mining operation of t.

In order to control the coal wall spalling in the fully mechanized high cutting longwall coal mining face,with the theoretic anal- ysis,numerical simulation,site measurement and other research methods,the paper studied the coal wall spalling mechanism of the fully mechanized longwall coal mining face.

Mechanism of the rib spalling and the controlling in the very soft coal seam;

Prevention rib spalling mechanics of stepped cutting technology was analyzed by numerical simulation.

The rib spalling is one of the main factors restricting the safe and high efficient mining of fully-mechanized caving with great minng height.

Analysis and Precaution Countermeasures of Casualty Accidents Incurred by Cave-in;

Causes and Prevention of Casualty Accidents Due to Cave-in;