不同地形条件下工作面埋深对开采沉陷的影响OA

To study the impact of the working face depth on mining subsidence under the influence of different terrain conditions,a coal mine in Shanxi Province was taken as the engineering background.A combination of theoretical analysis and MIDAS numerical simulations was used to study four situations:separately mining 8#and 11#coal under mountainous valley terrain conditions,and under plain terrain conditions.The surface movement and deformation characteristics,as well as the overlying rock stress-strain characteristics of each model during the mining process,were compared and analyzed.The results indicate that the settlement funnel formed by two working faces during repeated horizontal mining will affect each other,and the surface subsidence after mining is the superposition of the surface subsidence caused by single working face mining.When mining the same working face,the impact of different terrain conditions on surface deformation differs,and as the depth of the working face increases,the influence of terrain on mining subsidence decreases.As the depth of the coal seam increases,the overall subsidence of the surface decreases.However,under the terrain conditions of mountainous valleys,as the coal seam burial depth increases,the vertical displacement caused by coal mining on the surface directly above the middle coal pillar correspondingly increases.These research results provide reference for surface protection and geological disaster prevention in similar loess valley areas.