| This paper through theoretical analysis, similar material simulation experiment, numerical simulation, field engineering verification methods,systematically studied the characteristics of water inrush from coal mining working face in the process of multilayer confined water,confined water for multi working face water inrush prevention and provide a theoretical basis for. The main research contents and results are as follows:(1) Based on crack intensity factor criterion, combined with the theory of rock pressure, fluid mechanics and damage mechanics theory,the non closed and closed cracks in floor rock is no pressure and depth of theoretical formula containing failure under the action of the water pressure of the working face floor, floor damage and crack development law the mechanical analysis, put forward multi working face floor confined water outburst prevention design scheme, calculated according to the scheme of security analysis, 10205 working face of aquifuge thickness is 65m.(2) According to the geological conditions of coal mine Zhuang country, using method of similar material simulation experiment, study the different thickness of aquifuge, different pressure of aquifer under the action of the working face floor cracks and water inrush law, the multilayer confined water under the action of the top and bottom of bottom plate and fracture characteristics of failure.(3) By using the finite element numerical simulation method,through the research on the pressure of aquifer, aquiclude thickness,aquifer layers of three factors, the multi working face of confined water inrush were analyzed, obtained in multilayer confined water under the action of the bottom plastic damage characteristics and variation of seepage and pore plate the pressure of water inrush law of floor confined water multilayer working face, and the difference between multilayer confined water working surface and the monolayer of confined water inrush in working face water. |
PDF Full Text Request