新二郎山隧道通风系统局部结构优化研究

新二郎山隧道长13.4 km,采用四斜井三区段分段纵向式通风。为了降低隧道运营期间的通风能耗,通过数值模拟对隧道通风系统中的渐缩风道长度以及渐缩角度、渐扩风道长度以及渐扩角度、弯曲风道弯曲角度进行了优化;借鉴泥巴山隧道竖井自然风通道经验,增设自然风通道排水设施与风道控制风门,设计了新二郎山隧道的自然风通道;利用CFJZ6通风机综合测试仪对隧道通风系统渐扩段建成后的局部阻力损失系数进行了现场实测。根据优化结果推荐其渐缩段风道渐缩角度为10°,风道长度为6.8 m;渐扩段风道渐扩角度为10°,风道长度为24.1 m;弯曲风道弯曲角度80°。优化后渐扩段局部阻力系数为0.100 7远小于优化前的0.380 2。

Optimization of the New Erlangshan Tunnel Ventilation System Local Structure

The length of the new Erlangsahan tunnel is 13.4km, and a 3-section with 4-shaft ventilation system was applied in this tunnel. In order to decrease the energy assumption during the tunnel operation, a numerical simulation method was used to optimize the local structure of the ventilation system including the length and angle of cross section increasing duct, the length and angle of cross section decreasing duct and the curve angle of the curve duct. Take advantage of the nature ventilation duct building experience of Nibashan tunnel, the air control doors and drainage facilities were designed for the Erlangshan tunnel nature ventilation duct. The CFJZ6 ventilator comprehensive testers was used in the field test to examine the effectiveness of the optimization results. From the study, the recommended results are listed-length of cross section increasing duct is 6.8 m and its angle is 10°, and the length of cross section decreasing duct is 24.1 m and its angle is 10°. And the curve angle of curve duct is 80°. From the in situ test, the local resistance coefficient of optimized duct is 0.100 7, which is much smaller than the 0.380 2 before optimization.