Abstract
With the continuous downward mining, more and more attention has been paid to the problem of slope stability under open-pit combined mining. Taking Zijinshan gold and copper mining as an example, the failure properties of overlying rock mass and slope stability under open-pit combined mining under different mining methods are studied by numerical simulation method, and the failure law of overlying rock mass is proposed. Combined with the geological structure distribution of 5-5 section and the influence of different mining stages, the slope stability is evaluated by slip field theory. Relevant reinforcement measures are proposed.
Highlights
Slope stability has always been the most concerned issue in the field of slope engineering, especially the slope stability under the condition of open-pit to underground mining
The underground mining area excavation is divided into four stages : from + 30m mining to 0m stage, -50m stage, -100m stage and-150m stage ; Considering the spatial distribution and time effect of excavation, a prediction model of rock movement of open-pit combined mining slope considering the time-space effect of slope rock mass is proposed on the basis of the two
According to the velocity vector diagram of overlying rock mass from mining to each stage, it can be seen that when mining by filling goaf : (1) When the underground mining is from + 30m to 0m, the velocity vector of the slope rock mass is mainly controlled by the slip field generated by the slope excavation, and the slope is sliding failure, and the slope is in a stable state
Summary
Slope stability has always been the most concerned issue in the field of slope engineering, especially the slope stability under the condition of open-pit to underground mining. There are many mining areas in China that use open-pit to underground mining[1]. Under the influence of composite mining effect, the comprehensive effect of two mining operations should be fully considered in the stability analysis of slope[3].In the open pit combined mining, with the increase of mining depth, the slope stability coefficient is gradually decreasing, and the slope begins to lose stability. The deformation mechanism is more complex than the single open pit mining, and the stability of the slope is more difficult to control. In order to ensure the stability of the mine slope and save the cost of protection and treatment, it is of great significance to study the deformation mechanism of the slope under open-pit combined mining[4]
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