Geological Hazards of Coal-Mining Subsidence and Types of Subsidence Area in Guizhou

Geological hazards of mines caused by coal-mining subsidence in Guizhou mainly include ground fissure,landslide,collapse and debris flow.At the same time,those geologic environment problems differ greatly in the degree of developing and influencing in different areas of coal-mining subsidence.The coal-mining subsidence area could be divided into three types,namely,Liupanshui mixed subsidence area,Guiyang-Bijie moderate subsidence area and Eastern Guizhou slight subsidence area.Among these areas,surface subsidence deformation of the first one's goal is the most obvious,which easily contributes to secondary geological disaster.So this area is the most deeply damaged.The second area's surface subsidence deformation is the less obvious.Secondary geological hazards caused by mining subsidence are less possible and harmful than the former area.Surface subsidence deformation of the Eastern Guizhou slight subsidence area is not so obvious.Land collapse in this area seldom occurs.