京沪高铁隧道洞门气动特性分析

在高速铁路建设中，隧道出口微压波控制是要考虑的重要课题之一。结合京沪高铁的西渴马二号隧道，对隧道洞口缓冲结构的设置参数进行了数值分析，评价了削竹结构和顶部开口结构在单一设置和组合设置情况下，对缓解微压波的效果。分析结果表明:开口式缓冲结构效果更好；组合缓冲结构的优化参数不可照搬单一设置时的优化参数。同时，通过分析，也证明了计算工况所采用的缓冲结构参数是科学合理的。

Analysis on Aerodynamic Characteristics of Tunnel Portal at Beijing-Shanghai Express Railway

In the course of high-speed railway building, controlling micro-pressure wave around tunnel exit is one of the problems that should be considered seriously. This paper, combining with the project of Xikema Tunnel 2 on Beijing-Shanghai high-speed railway, carried out numeral simulation in relation to parameter settings of buffer structure of the tunnel portal, and then assessed the effect of bamboo-truncating portal, top-opening hood and their combination on relief efficiency of micro-pressure wave respectively. The results show that as regards the relief efficiency, top-opening structure is better, and the optimized parameters of the combined buffer structure shall not simply copy those of the single structure; at the same time, through analysis, the results also indicate that the parameters of the buffer structure used in these cases are scientific and reasonable.