Research status and development trend of coal mining under water-preserving

To achieve the aim that coal mining under water-preserving is the development trend and requirement of ecological environment in coal mine area,and s ystematically summarizing achievements in the technology of coal mining under water-preserving and further promoting its development,the theory of coal mining under water-preserving and research status of mining technology were summarized comprehensively using the method of comprehensive analysis,based on overviews the rec ent achievement and the latest development of coal mining under water-preserving.ln addition,the development trend in this field was pointed out. The study results sho wed that the focus on achieving the goal of coal mining under water-preserving was selection of reasonable mining upper limit and the appropriate mining methods to C ontrol ecological water level based on specific hydro-geological conditions.The further study trend is to improve the prediction accuracy of development height of the fra ctured water-conducted zone by researching on spatial combination characteristics of overlying strata in main mining coal seam and conforming combination form of gro undwater,coal,rock and so on in three dimensional spaces.