Study on multilevel fuzzy comprehensive evaluation of coalmine

Based on related laws, regulations, technical standards as well as situations in coal enterprises, the index system of risk evaluation was established, including natural risks, safety management risks, safety technology risks and market risks with 4 primary indexes, 21 secondary ones and 142 third ones. the reasonable and feasible AHP was selected, and the comprehensive model of by stages of multilevel fuzzy risk evaluation was built. The risk level of the Coal Industry Group was determined