Numerical Simulation Study on Deformation and Instability of Landslides in Open-Pit Mines under Mining-Induced Influences
Repeated mining operations in open-pit mines have led to the formation of extensive old landslides,posing a serious threat to the safe extraction of minerals.Taking the footwall landslide of the Nanfen open-pit mine as an example,this paper explores the deformation and instability mechanisms of old landslides under mining-induced influences.First,based on field survey results,the characteristics and evolution sequence of the landslide are investigated,and a three-dimensional geological model of the slope is constructed.The joint simulation method of COMSOL and MATLAB is used to explore the entire evolution process of the landslide under mining influences.The results show that old landslides cause the southern side of the landslide area to become empty and lose support,triggering deformation of the slope that progressively extends and accumulates northward.This process continues until the potential slip surface,which was initially near its limit state,becomes continuous,resulting in overall sliding.The simulation results,combined with observed damage zones and displacement trends,indicate varying degrees of activation in the structural planes within the landslide area.The evolution process shows a certain synchronicity with the damage zones,consistent with the observed displacement field.Analysis of the deformation mechanism reveals that,under mining activities,the old landslide at the Nanfen open-pit mine transitions from a slow creeping state to an accelerated deformation state,ultimately leading to the re-deformation and instability of the old landslide area.
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