关键词: 金属矿山, 通风安全, 局部通风, 通风设计, 解算模拟

Abstract: In order to solve the problems of poor air quality，low wind speed，and accumulation of harmful gases in the exploration vein level roadway of a certain metal mine at -560 m，combined with the ac‐ tual conditions of the roadway engineering，a three-dimensional research method combining theoretical cal‐ culation，software simulation，and on-site measurement was adopted，and fluid mechanics and ventilation engineering theory were applied to establish a local ventilation system solution model. We have carried out local ventilation design for single ended tunnels from the aspects of ventilation mode，required air volume of the working face，resistance，local fan model，matching air duct size and layout form. Ventilation software is used to calculate and simulate the rationality of the design scheme，which conducts on-site experiments in the mine. The results show that in the process of mining through vein roadway excavation，a composite venti‐ lation method of "pressure type main+induced draft fan guidance" is adopted. DJK50- № 8/2 × 30 kW coun‐ ter rotating fan is selected，and a flexible flame retardant air duct with a diameter of 800 mm is matched to supply air to the working face. JK40-1 № 6.5/11 kW fan is arranged 150 m away from the fan to connect with a flexible flame retardant air duct with a diameter of 600 mm to divert the polluted air in the roadway. The average wind speed of the on-site testing work face remained above 0.6 m/s，meeting the requirements of the "Safety Regulations for Metal and Non Metal Mines". During the operation of the system，the actual air volume of the local fan reached 120% of the design value，and the air quality in the tunnel was signifi‐ cantly improved，effectively ensuring the health of underground workers and the safety of excavation con‐ struction，providing quantifiable engineering reference for solving the ventilation problem of single head ex‐ cavation in similar mines.

Key words: metal mines, ventilation safety, local ventilation, ventilation design, solution simulation