Abstract The simulation of floor rock fracture evolution characteristics in deep mining is the key of research on laws and evolution mechanism of water-inrush. In order to launch the model test on emergence of water-inrush channel in deep mining floor under high water pressure,based on the similarity theory for solid-fluid coupling and the study of solid materials,a new similar material for solid-fluid coupling was developed. This material is suitable for conditions of deep mining. The measuring method for the permeability coefficient of this material was put forward. The influence law that diverse ratios affected mechanical properties of materials was concluded. The material was applied to the simulation test of water-inrush in floor,which revealed failure characteristics of similar materials and evolution characteristics of water-inrush channel in floor. Fracture developed rapidly and with higher degree affected by mining in open-off cut. This explained the greater probability of water inrush,this place is prone to result in water inrush risk. The method has some practical meaning for coal mining engineering.
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