Abstract
As the scale and depth of mines increase, large deformations of high-steep slopes progressively become prominent. Compared with the ordinary cables, negative Poisson’s ratio (NPR) cables can provide a constant resistance force and high deformation inhibition during slope deformation, avoiding the occurrence of slope instability hazards. Consequently, the control effects on the toppling failures of slopes were necessary to be researched. Changshanhao open-pit gold mine was taken as an example; based on the field geological investigation and rock mechanics testing, a three-dimensional engineering geological model of open-pit mine was constructed. Subsequently, the stability of open pit in current situation and final boundary situation was estimated with FLAC3D software, for the potential slope vulnerable areas to be comprehensively identified. Finally, the control effects of ordinary cables and NPR cables on the instable W13 slope section were compared and studied through FLAC3D simulations, and the reinforcement effects of NPR cable on the anti-dip slope were proved as significant; meanwhile, the corresponding reinforcement methods in the failure mine areas were proposed, laying a reference for the instability failure control and reinforcement of similar anti-dip slopes.
Highlights
Slope stability of open-pit mine constitutes a long-term research topic accompanied by open-pit mining
Analysis Results of Slope Stability. rough the numerical results of 13 slope sections, combined with the analysis results of overall open-pit stability, the potential slope vulnerable areas after the excavation of final boundary were comprehensively identified. e results demonstrated that W1–W3 slope sections in current situation were basically stable at the west U-shaped groove, while certain shallow damage might locally occur after the excavation of final boundary; W4–W7 slope sections on the west side of midline might present slip damages of various degrees after the excavation of final boundary; W8 slope section was easy to induce large-scale instability failure when the slope would be excavated to the joint zone at the slope foot; the other slope sections in the current and final boundary
Based on the energy-absorption reinforcement mechanics through negative Poisson’s ratio (NPR) cables, the control effects of ordinary (PR cable) and NPR cables on the toppling failure in the mining area were studied through the numerical calculation method
Summary
Slope stability of open-pit mine constitutes a long-term research topic accompanied by open-pit mining. Zhang et al built a new recognition model to assess the risk grade of expansive soil slope stability during construction, and the rationality of the proposed model was proved [8]. Shock and Vibration mine was taken as example In this case, Zou et al used the methods of limit equilibrium analysis, neural network, and finite element simulation to evaluate the slope stability [15]. The control measures used for slope reinforcement, such as cables, bolts, and retaining walls, belong to small deformation materials or rigid materials, which cannot resist the special toppling failure deformation, resulting in sudden large deformation and landslides of slope in open-pit mine. The control effects of PR and NPR cables on the instable W13 section slope were compared and studied through FLAC3D software, and the control effects of NPR cable on the toppling failure of slope were proved
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