Study On The Floor Stability And Groundwater Permeability Of A Group Coal Mining In The PAN XIE Area

Confined water safety is at present our country many mining coal face urgent and practical problem. In the process of coal seam mining rock bottom of the stability and the rock mass flow process is a complicated process, it is the seepage field and stress field of the influence each other. The PANXIE mining group in huainan of A coal mining of the actual geological conditions, the main research contents results are as follows:(1) Through to the pan thank mining area actual rock sampling, the rock permeability test and research, and conclude that the rocks complete the penetration of the law.(2) Use theory of elastic and plastic theory, combined with the pan thank mining area down roof falls characteristics and stress distribution, that the destruction of the floor under the condition of depth.(3)The COMSOL physical field numerical simulation software, the stress field and seepage field coupling case, A group of coal mining area pan in different conditions (different distance, different face of length, different thickness and different water-resisting layer in thick, etc.) of the floor stability of mining under the simulation analysis, the results show that the necessary measures to guarantee the safety of the next, at present the mining conditions is the basic feasible.Along with the advance of working face and face width increasing, rock floor failure depth generally maintained at15-18m; as aquifuge thickness increasing, the rupture of floor strata depth and size decreases; mining thickness increases, floor failure depth increases.(4) Through the simulation experiment and non-contact optical measurement technology, studied the A3coal seam mining full height of floor failure condition, the results show that, similar to the results of simulation with the theoretical analysis and the corresponding numerical simulation results basically coincide.