铁路拱形防风明洞风荷载研究

兰新铁路第二双线穿过著名的百里风区、三十里风区,其风害极为严重。为了最大限度地减少限速和停轮,在百里风区的核心区采用设置防风明洞的防护措施。通过CFD数值模拟与风洞模型试验研究,得出了作用在防风明洞表面的风荷载随风速增大而增大,且迎风侧为正压、背风侧及拱顶为负压的分布规律。

Study of Wind Load on Arched Anti-wind Opencut Tunnel for Railway

The second double-tracked Lanzhou-Xinjiang Railway passes through the famous"100 km wind zone"and"30 km wind zone"where the wind hazards are very serious. Therefore,in order to minimize both speed limitaiton and wheel stopping,the anti-wind opencut tunnel was installed as a prevention measure at the core area of"100 km wind zone". In this study,after the CFD numerical simulation as well as wind-tunnel model experiment and research,the distribution pattern of wind load acting on the anti-wind opencut tunnel surface was ascertained as follows: the wind load will increase with the increasing of wind speed; the wind load presentes positive pressure on the windward side,and presents negative pressure on the leeward side and on the arch crown.