Model for safety evaluation of coal mine roof based on evidence fusion theory

Aiming at the complexity and uncertainty of mine roof monitoring data source,the sensors of monitoring system got different information and the measure of roof safety according to the pre-set threshold values,assigned a reliability for all propositions by constructing the basic probability distribution function.After multi-evidence amalgamation that applied combination rule of Dempster-Shafer evidence theory,it showed the mine roof safety status.Historical data analysis proves that the model can significantly reduce the roof safety monitoring system probability of false alarm,and increase the accuracy of determining the roof safety status.