特长公路隧道风仓式通风参数优化研究

Study on Optimization of Ventilation Parameters of Air Cabin in Long Highway Tunnel

为了研究特长公路隧道单斜井辅助双正洞四掌子面施工风仓接力通风方式的合理结构形式,以延崇高速公路松山隧道1号斜井施工通风为工程依托,采用基于有限体积的Fluent程序求解风仓内部流体控制方程,计算分析了风仓内部压力场和速度场,进一步通过轴流风机理论计算分析获得轴流风机通风效率,并对风仓形式和尺寸参数进行讨论。研究结果表明:普通风仓的最优长度和高度分别为30m和2m,隔板风仓的最优长度和高度分别为20m和2.5m;隔板风仓的通风效率要优于普通风仓;风仓一端2台轴流风机最优间距为2m;风机通风效率随着隔板长度的增加而下降,风机不设置隔板通风效率最优。

To study the proper structural form of air cabin relay ventilation assisted by the single inclined shaft in the extra-long highway tunnel construction ventilation process of the four tunnel faces,based on the construction ventilation of No.1 inclined shaft in Songshan Tunnel of Yanqing-Chongli Highway,the fluent program based on finite volume is used to solve the internal fluid control equation of air cabin. The pressure field and velocity field in the air cabin are calculated and analyzed. Furthermore,the ventilation efficiency of the axial fan is obtained by theoretical calculation,and the form and size parameters of the air cabin are discussed. The result shows that the optimal length and height of ordinary air cabin are 30 m and 2 m respectively,and the optimal length and height of partition air cabin are 20 m and 2. 5 m respectively;the ventilation efficiency of partition air cabin is better than that of the ordinary cabin;the optimal distance between two axial fans at the air cabin end is 2 m;the fan ventilation efficiency decreases with the partition length increases,and the ventilation efficiency of the fan without partition is the best.