Landslide is a phenomenon that the rock mass or land on slopes slide down through weak plane or weak belt under the effect of gravity because of various reasons, commonly known as "running mountain", "slippery floor","soil slip" etc.
It is affected by factors such as river erosion, groundwater activity, rainwater immersion, earthquake and artificial slope. Under the action of gravity, along a certain weak or weak zone, it is dispersed or dispersed. The natural phenomenon of sliding down the slope. The moving rock (soil) body is called the displacement body or the slip body, and the unmoved underlying rock (soil) body is called the sliding bed.
The debris flow in the world happens frequently in mountainous region of the Pacific Rim, the Alpine-Himalayan belt of folded strata, and the inner parts of Eurasia. According to statistics, more than 50 countries have the potential threat of debris flow, among which are Colombia, Peru, Switzerland, China, Japan and so on. Among them, there are more than 60 thousand mudslides in Japan, and mudslides are frequent in spring and summer.
On July 3, 1980, a landslide occurred in the Tiexi railway station on Chengkun railway, becoming the most serious landslide in China's railway history.
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