关键词: 挡风墙, 实验段, 环境风速, 衰减率, 防风效果

Abstract: Based on the hourly observation data of 8 gradient wind stations within DK1518 and DK1527 wind-break wall experimental sections of Lan-Xin double-track railway line from June 2012 to May 2013, the anti-wind capability of wind-break wall was evaluated by contrasting the wind speed at different positions and height between two sides of the wind-break wall. The results show that the wind-break wall could obviously change the direction and speed of ambient wind. After the ambient wind blew over the wind-break wall, the wind speed above the top of the wind-break wall increased, while that below the height of the wind-break wall decreased obviously. The closer to the wind-break wall, the more obviously the wind speed decayed, all of these verified the effectiveness of the wind-break wall. The windproof effect of the wind-break wall was still significant under high wind conditions with different levels, and the ambient wind speed could be reduced by 72% in the middle and lower parts of the wind-break wall. The blocking effect of the wind-break wall on the wind direction was as follows: the direction of the wind at a lower level below the height of the wall changed significantly and resulted in a flow around, whereas the wind direction was less affected and was basically consistent with the direction outside the wall at the position above the wall.

Key words: wind-break wall, experimental section, ambient wind speed, attenuation rate, windbreak effect