Abstract: Deep mining water inrush has the characteristics of sudden, hysteretic nature and strong induced disaster, and studying the water inrush channel genesis, evolution and disaster causing mechanism become the key to the control of deep mine water inrush. A lot of water prevention practice and control theory confirm that the fault water inrush channel generally occurs in the structure and strata contact surfaces, based on which concealed structure block body water inrush criterion model is established, besides, the theoretical criterion of water inrush is obtained by using shear failure theory. By means of the deep confined water, the activation and the evolution of the water conduction channel in the bottom of the pressure water are simulated. A similar solid-fluid coupling material is developed, and the feasibility analysis of the material is selected to simulate the fault failure. Experiment shows the whole process of floor crack formation, concealed fault propagation, water inrush channel of concealed fault floor directly under the action of mining stress disturbance and high pressure water. Mechanism of lagging water inrush from coal floor in confined water body under stress field and seepage field coupling is revealed, and the formation of water inrush path of the spatial variation is analyzed and discussed through the interpretation of the monitoring data and the phenomenon, which provides new methods and knowledge for the study of deep mining water inrush structure.

Key words: deep mining, concealed structure, activation of water inrush, experimental study