Aiming at the problems of low oxygen enrichment efficiency and serious waste of oxygen resources in the traditional diffusion oxygen-enrichment ventilation scheme of mechanized tunneling roadway in plateau mine，a new type of sectional oxygen-enrichment ventilation scheme was proposed. Based on the ANSYS-Fluent numerical simulation software，a comparison test was designed for the tunneling roadway of a metal mine at an altitude of 4 000 m，its goal is to increase the oxygen concentration in the aerobic area of the tunneling roadway to 26%. The differences of oxygen enrichment diffusion and oxygen spatial distribution between traditional diffusion oxygen-enrichment ventilation scheme and the sectional oxygen-enrichment ventilation scheme were analyzed. In order to evaluate the oxygen enrichment capacity of sectional oxygen-enrichment ventilation and traditional diffusion oxygen-enrichment ventilation，two indexes of target oxygen enrichment deviation and oxygen-enrichment transport efficiency were introduced. The results were as follows：Firstly，compared with the traditional diffusion oxygen-enrichment ventilation，the sectional oxygen-enrichment ventilation transferred the oxygen-enriched focus from the front area of the roadway without oxygen enriched demand to the middle and rear area of the roadway with higher oxygen-enriched demand. The oxygen enriched time was reduced from more than 5 min to 3 min，the oxygen concentration in the aerobic zone of the middle and end section of the roadway were increased from 22.1% and 24.3% to 24.6% and 25.5%，the oxygen enriched diffusion rate and diffusion range were elevated significantly，the defects of traditional diffusion oxygen-enrichment ventilation，such as slow diffusion of oxygen enrichment，narrow range of oxygen enri-chment and insufficient oxygen enrichment in the middle and rear sections of roadway were all improved. Secondly，the oxygen spatial distribution in the middle and back section of the segmented oxygen-enrichment ventilation roadway was uniform，which solved the problems of large oxygen concentration difference between the left and right sides in the middle section in the traditional diffusion oxygen-enrichment ventilation method’s roadway，and none-oxygen spatial distribution in one side of the pressure air duct in the back section of the roadway.Thirdly，the oxygen enrichment time of heading machine driver’s breathing belt was reduced from 255 s to 177 s，and the oxygen concentration increased from 22.51% to 25.24%.The oxygen enrichment rate and oxygen enrichment concentration of heading machine driver’s breathing zone were significantly improved，which provided a cleaner breathing environment for heading machine driver and ensured the smooth progress of tunneling operation. Finally，compared with the traditional diffusion oxygen-enrichment ventilation scheme，the target oxygen enrichment offset of sectional oxygen-enrichment ventilation was reduced from 4.385 to 1.372，and the oxygen utilization rate was increased from less than 5% to about 50%，which fully verified the oxygen enrichment effectiveness and superiority of sectional oxygen-enrichment ventilation scheme，and the study has certain guiding significance for the development of mechanized tunneling ventilation mode in plateau mine.

http://www.goldsci.ac.cn/article/2021/1005-2518/1005-2518-2021-29-5-698.shtml