单洞对向超特长隧道通风方案优化研究

总长7.954km的巴朗山隧道为单洞双向交通,为国内最长的单洞公路隧道。设计采用平导压入式分段纵向式通风方式。通过建立通风网络进行优化,计算出随着横通道打开条数的增多,通风能耗成一个下降趋势,当横通道全部打开时,通风能耗最少。但横通道全部打开,通风系统较为复杂,需要在各条横通道间设置风窗调节,实施及运营管理较为复杂,建议开启三条横通道送风。针对巴朗山隧道具体工况,通过建立目标函数,得出开启三条横通道的位置除了中间第五条横通道开启外,左侧开启的一条横通道在距洞口2 284 m,右侧开启的一条横通道在距洞口2 192 m处所需风机风压最小,为最节能横通道位置。

Study on Ventilation Scheme Optimization for Two-Way Extra-Long Tunnel of in One Tube

As the longest one-tube highway tunnel in China,the 7.954 km long Balang Mountain Tunnel is a two-way traffic tunnel applying parallel-guide-pit forced section longitudinal ventilation.The computation based on ventilation network optimization shows that the ventilation energy consumption decreases as the number of opening passages increases,and the minimal value is at the moment when all the passages are open.However,for such case the ventilation system will be complex,and windshields are needed between passages,leading to complicated construction and operation,thus,it is advised to open 3 passages for ventilation.A target function is established considering the situation in Balang Mountain tunnel,and the result shows that when the fifth passage in the middle portion,the left passage 2 284 m away from the portal,as well as the right passage 2192m away from the tunnel portal are open,the fan wind pressure will be minimal,and such arrangement of passages is the most energy saving one.