Coal mine safety risk assessment based on cloud model and combination weighting

For problems of weak foundation, single means and weak objectivity of coal mine safety risk assessment in China, a coal mine safety risk assessment model was constructed based on cloud model theory and combination weighting method of subjective weighting by AHP and objective weighting by grey correlation analysis. Firstly, a coal mine safety risk assessment index system is established, which includes 5 first-level assessment indexes of personnel, equipment, environment, management and history，and 29 second-level assessment indexes. Then, cloud model scale of the coal mine safety risk assessment indexes is established. Finally, digital characteristics of index layer, criterion layer and target layer in the coal mine safety risk assessment index system are calculated by use of safety risk assessment cloud model to get coal mine safety risk assessment cloud. The model has been applied to safety risk assessment of Hongqingliang Coal Mine. The results show that safety risk level of the coal mine is medium at present, and the main factors affecting safety production are operation rate of operators against rules, stability of coal-seam roof and floor and other indexes, which provides a certain reference for safety management and risk prevention and control of coal mine.