关键词: 开采沉陷, MapGIS, 基础地质数据库, 预计模型

Abstract: In order to prediction the surface subsidence and deformation information caused by mining,taking the Dahongshan iron mine as the research example,based on site engineering geological exploration and collection of the deformation monitoring data,firstly,according to the drilling data in mining area (drilling depth,drilling hole height,depth of ground water level,stratum lithology,stratum structure and thickness and stratum age),the basic geological database is established;then,the mining subsidence influence factors are analyzed from the aspects of terrain slope,geological structure,lithology conditions,vegetation coverage,mining area and depth,they are assigned weighted values respectively;thirdly,the damaged level of the surface buildings in the mining area is divided into four levels based on the horizontal,vertical and curvature deformation values in the mining area;finally,according to the basic geological data,the mining subsidence prediction model is established by adopting MapGIS software,the dangerous regions of mining subsidence are divided in the mining area.The research results show that:①the weighted value of mining area and depth is 0.45,it is indicated that mining area and depth is the most important influence factors of the mining area;②the maximum surface subsidence value of 2# ore-body is 431.1 mm,the maximum horizontal movement value of 2# ore-body is 125 mm,the maximum tilt value of 2# ore-body is 4.95 mm,the prediction results are consistent with the actual measured data in the mining area;③the surface subsidence dangerous level of the 2# ore-body is Ⅳ,the building structure may be damaged in the region,therefore,it is necessary to take preventive measures timely.

Key words: Mining subsidence, MapGIS, Basic geological database, Prediction model