【摘要】 基于2012年6月至2013年5月兰新第二双线DK1518、DK1527两处高铁沿线挡风墙实验段8个梯度风逐时观测资料,通过对挡风墙外环境风和挡风墙内不同位置、不同高度风的监测资料对比分析,对挡风墙的实际防风效果进行总体评估。结果表明:挡风墙对环境风速、风向都有明显的改变,环境风吹至挡风墙遭阻挡翻越后,高于挡风墙顶部的风速增大,而低于挡风墙高度位置的风速呈明显减小,距离挡风墙越近风速衰减越明显,验证了挡风墙的防风效果。不同级别的大风情况下挡风墙防风效果依然显著,在挡风墙内的中下部区域对环境风速的减小可达72%。挡风墙对风向的阻挡作用表现为:低于挡风墙高度的低层位置(车体底部、车体中部)风向明显改变产生了绕流,而高于挡风墙的高层位置(接触网悬挂处、接触网导线),风向受挡风墙影响较小,与墙外环境风向基本一致。更多还原

【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.更多还原