Abstract
Rapid development of open-pit mining with increasingly more complex mining and geological conditions and the extraction of minerals from progressively deeper horizons has moved to the foreground of research in the control of the state of a rock mass. The volume factor is particularly important for the stability of pits flanks and benches. This paper considers the stressed state of an open pit in a three-dimensional case. In order to evaluate the influence of the three-dimensional factor on the stressed state and stability of mine benches and flanks, a segment of pit flank in the conjugation area of working and nonworking flanks was modeled (using the finite-element method). The main calculation area and the schematic breakdown into the basic elements are given. The general law described can be taken into consideration when developing a new method for ore excavation under the edge of flanks of open-pit mines. The principles of three-dimensional stressed state formulated in this paper are currently used to develop an innovative procedure for working steep deposit beds with internal bank formation. It is demonstrated how the volume factor affects the stressed state and stability, and qualitative and quantitative regularities of this influence are determined.
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