高寒地区多金属矿巷道掘进炮烟扩散规律研究

针对高海拔金属矿山井下爆破炮烟扩散产生的安全问题，以西藏甲玛铜矿4470m中段独头巷道为研究对象，借助Fluent软件开展高海拔金属矿山井下爆破炮烟扩散规律数值模拟计算，基于模拟结果研究不同通风工况对一氧化碳排除速度的影响；对通风期间的掘进巷道进行风险演化分析。结果表明:风量大小为2.03m3/s、风筒直径为0.5m的通风条件下，井下爆破产生的CO气体浓度在规定时间内即可达到井下作业安全标准；风筒口到掌子面距离与巷道内CO排除速度呈负相关性。基于上述规律将CO的扩散区域划分为安全区、亚安全区、中度危险区以及危险区4个区域，并得出对不同风量下，巷道达到安全区所需要的通风时间二者之间关系式。

Study on Smoke Diffusion Law of Polymetallic Mine Roadway in Alpine Region

Aimed at high altitude metal mine blasting fume diffusion of security problems, in Tibet JiaMa copper polymetallic 4470 m middle cul DE sac as the research object, with the help of Fluent software to carry out the high altitude metal mine blasting fume diffusion regularity of numerical simulation, based on the simulation results study the influence of different working condition of ventilation on the carbon monoxide ruled out speed;The risk evolution of roadway during ventilation period is analyzed.The results show that the concentration of CO gas produced by underground blasting can reach the safety standard of underground operation within the prescribed time under the ventilation condition of 2.03m3/s air volume and 0.5m air duct diameter.The distance from the air duct mouth to the face of the tunnel is negatively correlated with the CO removal velocity in the roadway.Based on the above rules, the CO diffusion area is divided into four areas: safe area, sub-safe area, moderate danger area and danger area, and the relationship between the ventilation time required for roadway to reach the safe area under different air volume is obtained.