公路背风半路堑积雪平台的优化研究

Optimization and Study of Snow Platform in Leeward Half-Cut of Highway

公路半路堑是易形成风雪害的路基断面形式之一,成灾时常造成公路路面被积雪掩埋,影响行车速度和行车安全,对公路背风半路堑的风雪害进行防治研究具有一定的实用价值。新疆是我国易发生风雪害的地区之一。以某跨天山高速公路为研究对象,以数值模拟为研究手段,研究雪粒在不同宽度、深度积雪平台内的沉积特征,以及积雪平台对公路路面风雪流速度的影响,开展积雪平台的设置优化研究。结果表明:在风雪流初始速度和山坡坡率一定的情况下,宽度越大、深度越深的积雪平台雪粒沉积效果越好,路面上风雪流的速度越大。综合考虑经济性和防雪效果,积雪平台的宽度应≥5.0 m,宜为5.0~6.0 m;深度应≥2.0 m,宜为2.0~2.5 m。

The half-cutting of highway is one of the subgrade section forms that are prone to the snow drift disaster, which causes the road to be buried by snow, affecting the driving speed and driving safety. Therefore, it is of great application value to study the prevention and treatment of such disaster on the lee side half-cutting of highway. Xinjiang is one of the regions prone to snow and snow damage in China. In the paper, taking an expressway project across the Tianshan Mountains as the study object, the deposition characteristics of snow particles in snow platforms with different widths and depths, and the influence of snow platforms on the speed of blowing and drifting snow on the road surface are studied to optimize the setting of snow platforms. The results show that when the initial speed of blowing and drifting snow and the mountain slope rate are constant, the deposition effect of snow in the snow platform with larger width and deeper depth is better, and the speed of blowing and drifting snow on the road surface is greater. On the basis of comprehensive consideration of economy and anti-snow drift disaster effect, the width of snow platform should be ≥ 5 m, preferably 5.0 to 6.0 m, and the depth should be ≥ 2.0 m, preferably 2.0 to 2.5 m.