寒区积雪堆蚀路基的室内风洞试验研究

Studied on Depositing Erosion of Accumulated Snow on Subgrade Slope Through Indoor wind Tunnel Experiment in Cold Region

以寒区公路路基作为研究对象,采用麸皮作为模型雪,通过室内风洞试验研究风雪流下雪粒子的起动,以及在路基不同部位的堆积,确定雪粒子沿路基坡面的堆积区域与路基断面之间的关系。试验结果表明,雪粒子在路基坡面的堆积区域与路基沿程风雪流的运动规律、雪粒子的天然密度、路基断面型式等密切相关。当路基模型高度不大于250mm时,雪粒子在路基迎风坡面和背风坡面堆积高度随路基高度的增加而增大,随路基边坡坡率的增加而增大。当路基边坡坡率为1∶1时,雪粒子在迎风坡面上的堆积高度约为路基模型高度的57.5%,在背风坡的堆积高度为路基模型高度的79%。当边坡坡率1∶2.5时,雪粒子在迎风坡面上的堆积高度为路基模型高度的34.4%;雪粒子在背风坡的堆积高度为路基模型高度的76.7%。

Taking the subgrade in cold region highway as the research object,using bran as simulant snow in indoor wind tunnel experiment,the relationship between accumulation area of snow particles along the subgrade and embankment section was determined by analyzing experimental results.The experiment results were summarized for the movement and accumulation of snow particles,depositing erosion and carrying processes of snow particles in different parts along the subgrade slope.The results indicated that：the accumulation area of the snow particles in the subgrade slope surface was closely related to these factors including the moving rules of the wind-drift snow,natural density of the snow particles and the sections of subgrade.When the subgrade height was no more than 250 mm,the more subgrade height and the great slope gradient was,the more accumulation areas along the windward and leeward slope surface.While the slope rate was 1∶1,accumulation height of snow particles along the windward slopes was 57.5percent whereas was 79 along the leeward slope surface.But when the slope rate was 1∶2.5,snow particles along the windward slope was 34.4percent and the 76.7along the leeward slope surface,as opposed to the subgrade model height.