The underground working environment of mines is of great significance to safe production.Both the underground fire area and the mining production of sulfur-bearing mines will exert a considerable influence on the underground air environment.To undertake a comprehensive and precise assessment of underground air quality,an online monitoring system for underground air quality was established,and an underground air quality index model was developed in conjunction with relevant safety protocols to quantify the monitoring data.SO2,NO2,CO,and H2S gases were selected as evaluation indicators,and the weights of each index were determined through the analytic hierarchy process.Based on the fuzzy comprehensive evaluation approach,the evaluation model of underground air quality in sulfur-bearing mines is developed to achieve a comprehensive evaluation of underground air quality.The results indicate that the comprehensive evaluation grade of air quality near the underground fire area of Tongkeng Mine is favorable,which is in line with the outcomes of online monitoring and analysis,and conforms to the objective engineering practice,providing a scientific and comprehensive evaluation means for the underground air environment of sulfur-bearing mines.
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