Technical analysis and prevention of roadway roof-fall accident under conditions of complex roof;

The roof fall accidents in belt supported coal entries are analyzed,the cause of accidents are pointed out,and related measures are put forward;which means the accidents are preventable.

The reasons for the coal mine roof fall are analysed in detail and the preventive measures of avoiding the accidence of coal mine roof fall are presented.

Prevention on workface's roof accidents in big inclined seam;

Aiming at the types of roof accidents in four western mines of Yima Mining Area,the cause was analyzed,and the preventing measures were put forward, the roof graveness accidents can be avoided consequently.

The paper has analyzed the mine gas and roof accidents.

The roof accidents are cutt off.

Aiming at the frequently-occurring roof accidents in small collieries in the south of Ganzhou, the author analyzes the characteristics and causes of the accidents and raises corresponding countermeasures.

Through analysis of a typical case , this paper introduces the analysis method with safety system, which plays an important role in roof accident prediction and control combined with good institutional improvement.

This paper analyzes the roof leakage accidents at the end of fully-mechanized face in Wangcun Coal Mine,and advances some measures for preventing roof leakage.

In view of how accident of the roof carried on according to the strength source  this paper analysed the good support performance of the stope support and the maintenance performance which must have good stabilities in detail.