Abstract:
To investigate the precise prevention and control measures for ground collapse in mining areas, the authors in this study selected Xiangtan Manganese mining area as the study object. Geological environmental, hydrogeological, and engineering geological data for the study area were collected to analyze the developmental characteristics, influencing factors, and genetic mechanisms of ground collapse. The factor matrices for susceptibility and risk assessments were established, according to the main control factors of karst collapse (stratigraphic lithology, structure, overburden thickness, configuration and properties, hydrodynamic conditions) and the main control factors of goaf collapse (seam burial conditions, mining methods and mining degree, groundwater, faults). And susceptibility and risk assessments for karst collapse and goaf collapse were conducted, and targeted prevention and control measures were proposed. The results show that the study area contains 3 high risk areas of karst collapse, which can be treated by ground filling for cracks and collapse holes, grouting and filling of underground karst regions. Additionally, there are 8 high risk areas of goaf collapse that require reducing pumping and drainage volumes, managing water level fluctuations, and implementing curtain grouting or backfilling and water filling if necessary. The research results could provide references for the prevention and control of ground collapse in Xiangtan Manganese mining area, serving as a guide for risk assessment of ground collapse in other areas.