Surface collapse disasters are mainly divided into three
types: karst collapse, goaf collapse and loess collapsibility.
The impact range is wide, often sudden, causing serious
damage to urban buildings, engineering facilities and people's
lives and property. With the increasing social engineering
economic activities, the degree of harm is also increasing.
Through the study of the distribution, occurrence mechanism
and formation regularity of the surface collapse disaster,
the purpose of controlling the damage can be achieved.
The distribution of surface collapse in China has a certain
time and space regularity. Karst collapse mainly occurs in
the karst areas with strong and moderate development of
covered carbonate rocks and is widely distributed. Guangxi,
Guangdong, Guizhou, Hunan, Hubei, Sichuan, Jiangxi, Liaoning,
Hebei and other provinces are the main distribution areas. The
collapse of karst in South China is more and stronger, and North
China is relatively less and weaker.