Abstract
The researches in the area of undermined rock massifs estimate the influence of advancing speed of mining stopes on earth’s surface shift-ing ambiguously. It reflects the lack of maturity of this trend. The aim of this paper is to establish the relationship between subsidence of individual points on the surface profile line along strike and the speed of stope’s advancing, taking into account other influencing factors. Dependencies of displacement of certain points of the earth’s surface undermined during mining operations can be identified by frequency instrumental observations on the profile lines. Further analysis is made by mathematical methods, in-cluding the random number theory. In the formation of the dynamic downfold of displacement the relationship between advancing speed and subsiding of individual points in the “behind the face” half-downfold can-not be traced. In the “front face” half-downfold the increase of mining stope advancing speed reduces dynamic subsidence. In the paper empirical relationships between subsidence of individual points on the surface and the position of the working face were shown.
Highlights
The Earth's surface is the part of a deformable earth formation, and its displacement reflects the processes that occur in undermined rock mass
The coefficients considering the depth of mining works and the extent of undermined rocks disintegration were introduced later [7]
This article presents some results of studies of the influence of powered face’s stope advancing speed during flat and inclined coal seams mining in Kuzbass on the dynamics of individual points of the undermined Earth's surface
Summary
The Earth's surface is the part of a deformable earth formation, and its displacement reflects the processes that occur in undermined rock mass. - The rule of “normal”, introduced by Gonot [1] and further developed by Dumont [2], is based on the seam’s roof decomposition on the following components: the normal to the bedding and the normal acting along the seam, which is balanced by the reaction of the underlying rocks. Based on this postulate, the roof displacement will occur only under the influence of the normal component;. The roof, consisting of several layers of rock, is considered as a set of beams
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