Analysis of influencing factors of water conducted zone in close distance coal seam group based on response surface method
Aiming at the problem of determining the development height of water conducted zone after contiguous coal seams mining,13 groups of experiments were designed by Box-Behnken method and the development height of water conducted zone in each group was obtained by numerical simulation.The influence of the interaction of the three factors of cumulative coal thickness,working face length and advancing distance on the development height of water conducted zone in contiguous seams was systematically analyzed.A quadratic response surface model with the development height of water conducted zone as the response value was constructed,and the stope parameters of the optimal three factors were obtained.The variance analysis of the simulation results shows that the cumulative coal thickness is the most significant factor affecting the development height of the water-conducting fracture zone.The weight of the factors affecting the development height of the water-conducting fracture zone is ranked from large to small:cumulative mining thickness,working face length,and advancing distance.The optimal parameters of the three factors are:when the cumulative coal thickness is 12 m and 20 m,the optimal working face length of 180 m;when the cumulative coal thickness is 28 m,the optimal working face length is 200 m.
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