Evaluation to Damage Situation of Coal Mining Subsidence Land in Mountainous Area based on MSPS and GIS

Take Songzao mining area in Chongqing for example, the damage situation of coal mining subsidence land in mountainous area was studied, optimum evaluation indexes for damage situation of land was selected by discussing existing evaluation indexes, and the contestant standard formed by using Delphi method, and grade of damage situation of coal mining subsidence land was confirmed by overlying analytical method of GIS raster data. The results showed that the degree of land destruction most belong to slight and middle damage, the relatively serious damage forms were collapse pit and collapse crack, and the degree of land destruction tends to weaken gradually from mining center to edge. There was a positive correlation between the degree of land destruction and mining degree.