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.