我局管辖的兰青、包兰、青藏、甘武等线,有11.5％的路基经常遭受风沙侵袭。每年春,冬大风季节,沙子上道,埋没钢轨,流入道床,形成“沙包”、“拱道”。有时仅一小时的大风,埋沙厚度就达10—80cm,严重危胁列车的安全运行。尤其是包兰线的中卫至干 Lanzhou, Baolan, Qinghai and Gansu provinces under the jurisdiction of our bureau, with 11.5% of the subgrade often being hit by sandstorms. Every spring and winter windy season, sand on the road, buried rails, into the channel bed, the formation of “sandbags”, “Archway.” Sometimes only one hour of wind, buried sand thickness of 10-80cm, a serious threat to the safe operation of the train. In particular, the whole line of Zhongwei to dry line