Abstract: Effective evaluation of the risk of water inrush from coal floor is the prerequisite and basis for coal mine water hazard control and safety mining. The paper researches the risk evaluation methods of water inrush from coal floor based on dimensionless multi-source information fusion technique. Taking Xin’an coal mine as example and based on systematic analysis of floor water inrush mechanism, six key factors affecting the water inrush from the floor of NO.21 coal seam including distribution of faults belts, distribution of the endpoints and intersection-points in faults, index of water inrush caused by faults, water pressure and watery of the Ordovician limestone aquifer and the effective aquifuge thickness are identified and dealt with dimensionless quantity due to the structural and hydro-geological conditions. The weights of each factor are determined by qualitative arrangement and quantitative transformation. After that, dimensionless multi-source information fusion model for the evaluation of the water inrush risk of NO.21 coal seam in Xin’an coal mine are established on the basis of the GIS multi-source information fusion technique. The result is proved to be reliable when the model is applied into the evaluation and prediction work of water inrush from coal floor in this coal mine.

Key words: water inrush from coal floor, evaluation of the water inrush risk, multi-source information fusion；geographic information system