Study On Mechanical Of Fault Activation And Water Inrush From Coal Mine

For a long time, coal mine water inrush accidents happened frequently in our country, because of the serious threat to the personal safety and coal mine production, the research of water inrush mechanism and water inrush prevention and control has been paid more attention in the field of coal research. One of the forms of mine water inrush accident is the water inrush from the bottom floor of mining face, and the water inrush from the bottom floor is mainly due to the activation of the interruption layer in the mining process, thus the connection between the bottom plate and the aquifer is produced, which forms a flow channel, water in aquifer through the cracks into the working surface cause the occurrence of mine water inrush accident. In the paper, the theoretical analys is and numerical s imulation methods are used to study the fault activation and the mechanical mechanism of water inrush.Firstly,the mechanical analys is model is created to analyze and study the fault activation and water inrush disaster caused by the fault of the bottom plate and the activation of the fault. The distribution law of stress around the fault in mining face is calculated, and the shear stress criterion for fault activation is established.In addition, by using the control volume method in fluid mechanics, the governing equations of flow dynamics in the flow through the fault are established, and the distribution of water pressure in the fracture is analyzed; By using the theory of fracture mechanics, the crack propagation law of fault zone is analyzed, and the criterion of crack propagation is established.Secondly, based on the actual situation of the mine productio n,the numerical simulation analysis model is established, through numerical simulation with FlowRFPAD-2software. Analys is and study of the mining in the mining floor fault activation characteristics and scope, simulation of the fault in floor gap, dip angle and water pressure on fault activation and the influence of water inrush. The results show that the fault of the base plate is bigger, the fault of the bottom plate is easier to activate; the dip of the bottom plate fault is smaller, the fault is easier to activate; the greater the pressure of the water pressure is, the more easily the fault is activated. The more easily the floor fault activation, the greater the possibility of water inrush disaster accident.