特长公路隧道纵向—全横向混合通风方式研究

Research on the Longitudinal-transverse Composite Ventilation System in Lengthy Highway Tunnels

就公路隧道的通风方式而言,目前纵向通风形式逐渐成为主流。但是,纵向通风也有其致命的弱点,如分段不能太长、防火救灾功能差、深埋隧道中间的通风竖井太长、施工困难等。因而对于特长公路隧道,研究除纵向通风形式之外的各种混合通风方式显然有着重要的理论和实践意义。介绍了一种纵向-全横向混合通风方式,并详细地推导了纵向-全横向通风计算方程,边界条件通过配点法满足。数值算例证明了纵向-半横向混合通风方式在特长公路隧道通风中应用的可行性。

At present, the longitudinal ventilation system is regarded as a major one in highway tunnels. However, there are fatal defects in the longitudinal ventilation system. For example, the length of each subsection is limited, the fire resistance and rescue functions cannot work well, the airshaft deeply buried is too long, and the execution is very difficult to be carried out, etc. Therefore, in respect to lengthy highway tunnels, the research on various combined ventilation systems expects that the longitudinal one is really important in theory and practice. In this paper, a longitudinal-transverse composite ventilation system is recommended, and the equations being used to compute ventilation are deduced in detail. The boundary conditions are met by means of the collocation method. Through numerical computation examples, it is proved that the application of the longitudinal-transverse composite ventilation system is feasible in lengthy highway tunnels.