Comment
Author: Admin | 2025-04-28
Of partition and stage boundary, but also includes the final mining boundary change caused by the change of mining depth. Therefore, it is more representative and convincing to choose inclined coal seam open-pit mine as an example. Thus, an idealized small open-pit coal mine is chosen as the research object in order to demonstrate the usefulness of the method in this work in solving the boundary optimization problem of open-pit mine under unknown conditions. The opencast coal mine’s progress is expected to be consistent every year in order to ensure the model’s effectiveness. Fig 7 depicts the small inclined coal seam open-pit mine’s two-dimensional topology.It is presumptive that the coal seam’s inclination angle and the final slope angle are both 45°. At the same time, the priority constraint is derived from the given block and the exfoliation of the inner and outer discharge is distinguished. The main economic indicators of the production link of the open-pit mine are given as shown in Table 1. It is assumed that the final mining boundary of the open-pit mine is flexible when the external environment changes, i.e., when the coal price exceeds the preset value, the mining depth can be appropriately increased, the open-pit mine boundary and the output of raw coal can be expanded, and vice versa.4.3 Optimal design of open-pit mine boundary under coal price fluctuationThe service life of open-pit mines is generally long, and the coal price fluctuates in various periods. The changes in coal prices in the coming period include three trends: rising, falling and basically stable. The simplest change trend of combined coal price can be obtained by the pairwise combination of three kinds of coal price change trends. The change of open-pit mine boundary in a particular period can be divided into five types: contraction, expansion, con-traction-expansion, expansion-contraction and basic stability, and the corresponding boundary trend is shown in Fig 8.Fig 8(A)–8(E) shows five state trends of contraction, expansion, contraction-expansion, expansion-contraction and basic stability, respectively, and the corresponding changes in coal prices are shown by coordinate diagrams. In the whole life cycle of open-pit mine, the changing
Add Comment