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In order to scientifically assess risks in the production and operation of underground mines and improve the safety prevention and control in underground mining, a risk assessment index system for underground mines was constructed by selecting five primary indices and 16 secondary indices based on the underground mining characteristics. And then, the subjective and objective weights of the assessment indices were determined by using analytic hierarchy process (AHP) and entropy weight method (EWM), and the comprehensive weight of the indices was also optimized by adopting a combined weighting method to improve the accuracy of the assessment results. The safety risk in underground mines was assessed with the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS). Later, five mines investigated by the experts organized by Hunan Bureau of the State Administration of Mine Safety were taken as samples for assessment with this method. The safety risk assessment results obtained with different models show that three risk indices with higher weights, including operation status of six equipment systems in terms of equipment factor, mine geological conditions in terms of environmental factor, and work safety system in terms of management factor, can bring obvious threat to the mine safety operation. The safety risk assessment of five mines shows that a tungsten mine has the highest risk level, while a graphite mine has the lowest risk level.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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