中文摘要：

正在建设的兰新第二双线是世界首条穿越大风区的高速铁路。线路穿越风区最大瞬时风速达64m/s,并伴随大量沙砾,严重威胁列车运行安全。如何在大风条件下防止列车倾覆、保护受电弓和接触网安全,避免沙砾侵道、击碎车窗玻璃成为兰新第二双线亟须解决的重要问题。本文通过数值计算、风洞试验和现场试验等方法,开展了挡风墙对列车的防风沙效果研究,研究结果表明：距轨面高2.5m以上的挡风墙对列车有较好的倾覆防护效果,防沙效果也较好,但对受电弓和接触网的接触安全防护效果较差,需要另外采取措施,确保受电弓和接触网的接触安全。

英文摘要：

The second double line of Lanzhou-Xinjiang railway being under construction is the first high-speed railway in the world which passes through strong wind area. The highest instantaneous wind speed can reach 64m/s along with lots of gravels, which brings serious threat to train operation safety. Therefore, how to protect trains being overturned and keep the safety of pantograph and catenary, avoiding gravels eroding and burying railway line, even breaking train glasses has become an urgent problem to be solved regard to the second double line of Lanzhou- Xinjiang railway. Based on numerical simulation, tunnel wind experiment and field test, series of researches were taken to evaluate the anti-wind/sand effect of windbreak wall on trains. The resuits show that windbreak wall with 2.5m high above the rail has better protective effect as well as anti-sand effect for trains. However, it is not safe enough for pantograph and catenary, some additional measures should be taken to ensure their safety.