Recommended and experimental values of the earth surface shift troughs parameters when conducting the stope works

Abstract

The correspondence of angular and linear parameters of the undermined rocks displacement and the crustal movement to their values determined according to the normative document has been established. Based on the surveying observations over the reference points movement on the earth surface and the stope face advance, the empirical curve of the trajectory of the earth surface maximum subsidence is determined from the points of maximum subsidence. The curve of the maximum subsidence of the earth surface points when removing the stope face from the face entry has been experimentally established, which allowed to determine the location of the point of the beginning of the crustal movement and the dimension of the stope mine working corresponding to this situation. The coordinates of the characteristic points of the earth surface subsidence above the stope face have been determined. A unified method has been developed for determining the angular and linear parameters of the undermined rocks displacement for the two stages of shift troughs formation on the earth surface. The nonconformities have been established between the recommended parameters and the experimental data normative documents during the anthracite seams mining.

Engineering method for predicting the displacement of the earth’s surface under the influence of stope workings of coal mines

“…530 C ' 6 of the Yubileynaya mine seam (table 1). The coefficients of equation ( 5) were also determined in two ways -by the least squares method and using dependencies (6,7,8) obtained from the results of correlation analysis (table 2).…”

“…In addition to these data indicated in the tables, there are also the average values of the characteristic points abscissas. They are calculated depending on the depth of the mining operations according to the method [19], which combines the exponential, hyperbolic tangent and logistic equations recommended respectively [7,[9][10][11], to describe the curve of subsidence of points on the earth's surface above the moving stope.…”

“…The second characterizes the shift of the undermined rocks and the earth's surface above the moving stope. The relationship between the stages of the formation of a shear trough on the earth's surface and the development of stopping operations in the excavation area is characterized [7] by a graph (figure 1).…”

“…For an analytical description of the dynamics of subsidence of the earth's surface under the influence of a moving stope, it was previously proposed to use logistic [7], exponential [9], or hyperbolic tangent [10] dependences. Comparative analysis of these dependences showed approximately the same, almost functional, convergence with experimental data.…”

“…In addition to equation ( 5), dependencies were proposed [7] to determine the coordinates of the characteristic points of the earth's surface displacement (figure 1) using the coefficients a p , b p , c p . The coordinates of point A (the beginning of the earth's surface displacement) in front of the stope, respectively, along the abscissa and ordinate axes:…”