特长隧道斜井转正洞段施工通风设计  

Construction Ventilation Design of Long Tunnel with Inclined Shaft Turning into Main Tunnel

作　　者：薛威 周保刚 XUE Wei;ZHOU Baogang(Shaanxi Provincial Transport Planning Design and Research Institute Co.,Ltd.,Xi’an 710000,China)

机构地区：[1]陕西省交通规划设计研究院有限公司,西安710000

出　　处：《科技和产业》2025年第7期94-100,共7页Science Technology and Industry

摘　　要：隧道施工通风能够有效排除有害气体和粉尘,保障施工环境安全。以野河山特长公路隧道为例,计算斜井及斜井转正洞多工作面施工需风量,选择适配风机型号,按照斜井与正洞施工进度对隧道施工通风进行分阶段设计。将分离式隧道一段作为通风巷道,采用“巷道+压入式”通风方式缩短风管供风长度。利用FLUENT软件建立多工作面施工通风三维数值模型,深入研究隧道内CO(一氧化碳)扩散规律。研究结果表明:CO以“气团”的形式从掌子面附近向洞口迁移,迁移速度与隧道内通风风速正相关;斜井交差处CO高浓度区随风速比的逐渐变大向右侧(低速区)偏移,且最大浓度逐渐减小;风速比对左洞CO浓度变化无明显影响。Tunnel construction ventilation can effectively eliminate harmful gases and dust,and ensure the safety of construction environment.Taking an extra-long road tunnel as an example,the air demand for the construction of inclined shafts and tunnels was calculated with multiple working faces,choose the appropriate fan models,and the tunnel construction ventilation in stages was designed according to the construction progress of inclined shafts and main caves.A section of the split tunnel was used as a ventilation tunnel,and the roadway+pressurized ventilation method is adopted to shorten the length of the air supply ducts.FLUENT software was used to establish a three-dimensional numerical model of multi-working face construction ventilation,in-depth study of CO(carbon monoxide)diffusion regulations in tunnels.The results of the study show that CO migrates from near the tunnel face to the entrance in the form of“air mass”,and the migration rate is positively correlated with the ventilation wind speed in the tunnel.The location of the high CO concentration zone at the intersection of the inclined shaft gradually shifts to the right(low velocity zone)as the wind velocity ratio gradually becomes larger,and the maximum concentration gradually decreases.The wind speed ratio has no significant effect on the change of CO concentration in the left hole.

关 键 词：隧道 施工通风 阶段设计 污染物扩散 数值模拟 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]