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路堤的阻挡作用致使路堤顶面局部出现风速过大的情况,影响行车安全。为了研究适合于侧风多发区路基的合理风障形式,分别建立了不透风风障和透风式风障的有限元模型,通过计算分析得到了不同工况下的风速场。依据风速的降低程度分析了基于行车安全的风障的合理形式。研究结果表明:不透风风障和透风式风障应高于2m;5m高路基可以采用65%及以下空隙率风障,而对于10m高路基可以采用75%及以下空隙率的风障;相同空隙率条件下,风障条间距的大小对风速场影响不大。
The blocking effect of the embankment causes the wind speed over the top of the embankment to be excessive, which affects traffic safety. In order to study the reasonable wind-induced failure modes suitable for cross-windy area subgrade, the finite element models of the air-tight wind-break and the air-through wind-break are respectively established. The wind speed field under different operating conditions is obtained through calculation and analysis. According to the reduction of wind speed, the reasonable form of wind barrier based on traffic safety is analyzed. The results show that the air-tight and the open-air wind barriers should be higher than 2m. The 5m high subgrade can use the air gap of 65% and below, while the wind barrier of 75% and below can be used for the subgrade of 10m. Under the condition of void ratio, the size of the wind barrier bars has little effect on the wind speed field.