“滑坡”是山区河谷綫上許多不良地質物理現象之一。它和“錯落”、“崩塌”、“堆塌”、“墜石”及“泥石洪流”……等现象,給山区鉄路带来了很大的危害。滑坡的种类和性質也是复杂的,因其性質不同与范圍有大小对綫路危害和威胁也有区別;其中以崩塌性滑坡毁坏最大。例如宝天鉄路某一崩塌性滑坡曾于1955年驟然滑动,滑动体达80万立方米,跨越路基,墜入渭河,因而該河中断了 “Landslides” are one of many unfavorable geophysical phenomena in the valley line of the mountainous area. Its phenomenon of “misalignment”, “collapse”, “collapse”, “falling stone” and “turf flood” has brought great harm to the roads in the mountains. The types and properties of landslides are also complex, because the nature of the landslides is different and the scope of the landslides is different from the hazards and threats to the route; among them, landslides are the most damaged. For example, a collapsing landslide on Baotianyu Road had suddenly slipped in 1955 and the sliding body reached 800,000 cubic meters. It crossed the roadbed and crashed into the Weihe River, and the river was interrupted.