Influences of surface movement parameters due to mining depth in eastern mining area

At present, the shallow coal resources in many eastern mining areas in China are gradually exhausted, and the mining depth is increasing year by year.Some mining areas have reached a mining depth of 1 kilometer.The law and dependent parameters of surface movement have changed obviously with the increase of mining depth.Based on a large number of measured data, this paper analyzes and compares the differences of surface movement parameters between deep mining and shallow mining in eastern mining area.The results show that with the increase of mining depth, the boundary angle and movement angle increase, the subsidence rate decreases, while the horizontal movement coefficient, the tangent of main influence angle and the migration coefficient of inflection point increase.The law of some parameters varying with width-to-depth ratio and depth-to-thickness ratio is obtained, and the corresponding fitting function relationship is established.