特长公路隧道运营网络通风技术

为了给特长公路隧道运营通风提供设计依据,以流体力学为基础,藉以图论理论与方法将隧道通风系统转化为通风网络,利用节点法通风计算软件解算隧道通风网络,根据公路隧道通风照明设计规范及依托工程交通量等具体情况,对隧道左右线各不同交通工况进行通风计算,以按需分风为原则确定合适的通风设备开启数量。在通风解算过程中,将交通风压拟合为隧道内通风量的三次多项式,以轴流风机形式加入通风网络,改变以往采用常量交通风压的计算方法。计算结果表明：隧道近远期通风设计方案均能够满足隧道通风要求,节点法网络通风技术的可行性及适用性较强;左线近期通风中交通风压随着交通车速的降低迅速减小,其在总风压中所占到的比例在5.94%～28.37%之间。

Network ventilation technology of operation period in super long highway tunnel

In order to give design basis for the super long highway tunnel,based on fluid dynamics,the tunnel ventilation system was converted to the ventilation network with the graph theory and method.The ventilation network was solved with the ventilation calculation software.According to the design standards of highway tunnel ventilation and lighting,the required air of different conditions in the about line of Mixiliang tunnel was calculated to determine a reasonable number of ventilation equipment and installation location.In the ventilation solver,the traffic pressure was fitted as cubic polynomial with the ventilation volume,and joined into the network as an axial flow fan.The results show that the tunnel ventilation design can meet the tunnel ventilation requirements,at the same time,the feasibility and applicability of the advantages of node method for network ventilation is demonstrated.The left lane of traffic in the recent ventilation air pressure decreases rapidly with the reduction of traffic speed,the proportion of the traffic pressure in the total pressure is between 5.94% to 28.37%.