铁道标准设计2025，Vol.69Issue(10)：231-238,8.DOI:10.13238/j.issn.1004-2954.202506110001
高海拔环境隧道爆破工况CO扩散规律与预测方法研究
Study on CO Diffusion Patterns and Prediction Methods under Tunnel Blasting Conditions in High-Altitude Environment
摘要
Abstract
During the construction of high-altitude tunnels using the drilling and blasting method,the low-pressure environment hinders the migration of carbon monoxide(CO)generated by blasting,leading to increased CO concentration and posing a threat to the safety of on-site personnel.Therefore,it is necessary to investigate the CO diffusion patterns and prediction methods for high-altitude tunnel construction.Based on a railway tunnel in Southwest China,this study established a numerical model for CO migration patterns.The calculation results were validated using field monitoring data.Subsequently,the patterns of CO migration and diffusion generated by blasting were analyzed,revealing the influence of altitude on CO diffusion patterns.Finally,a correction formula was developed to establish the relationship between CO concentration and the safe entry time.The result showed that(1)as the altitude increased from Om to 4 000 m,the air pressure decreased by 41.5％,and the initial mass fraction of CO increased by 59.8％.(2)Within the range from the tunnel face to the ventilation duct outlet,the wind speed was larger directly in front of the duct and on the diagonal side of the tunnel.As the distance from the tunnel face increased,the maximum wind speed gradually concentrated on the diagonal side of the duct.Beyond 200 m from the tunnel face,the wind speed became uniformly distributed across the cross-section.(3)With increasing ventilation time,the CO clouds at different locations gradually migrated toward the tunnel portal,and their concentration decreased gradually.The farther the location was from the duct side,the higher the CO cloud concentration and the faster the migration speed.The migration time of CO on the duct side was 120 seconds slower than that on the non-duct side.(4)The longitudinal distribution patterns of CO were essentially consistent across different altitudes.As ventilation time increased,the gas clouds gradually moved toward the tunnel portal.As the altitude rose,CO concentration showed an increasing trend.Specifically,when the altitude rose from 0 m to 4 000 m,the CO concentration increased by approximately 1.5 to 1.6 times.关键词
高海拔环境/施工隧道/数值模拟/CO扩散规律/预测方法Key words
high-altitude environment/construction tunnel/numerical simulation/CO diffusion patterns/prediction methods分类
交通运输引用本文复制引用
谭忠盛,周振梁,张辰,杨旸..高海拔环境隧道爆破工况CO扩散规律与预测方法研究[J].铁道标准设计,2025,69(10):231-238,8.基金项目
国家自然科学基金项目(52078304,52090804) （52078304,52090804）
新疆维吾尔自治区自然科学基金项目(2022D01C431) （2022D01C431）
