Deformation Failure Characteristics and Evolution Mechanism of Open-Pit Slopes Caused by the Transition from Open-Pit to Underground Mining
Mining induced disasters such as landslides,collapses,and surface subsidence have always been one of the hot and difficult research topics in the field of disaster prevention and reduction engineering.In order to reveal the evolution mechanism of open-pit landslides and surface subsidence disasters caused by underground mining,remote sensing images,on-site investigations,and numerical simulation studies were used to study the deformation and failure characteristics of open-pit slopes and surface subsidence.The research results indicate that the formation of landslides in open-pit mining areas mainly undergoes the following processes:stability-slope collapse-large scale collapse-surface subsidence cave-surface subsidence landslide-northern slope collapse.The northern slope angle is too steep,and there is a possibility of further collapse and landslide under the coupling influence of faults and underground goafs.The formation mechanism of collapse pits is mainly divided into four stages,including,disturbance and collapse of overlying rock layers on the ore body,collapse of open-pit stope,collapsed holes appearing on the mountain surface,as well as landslide of open-pit stope and surface collapse of mountain body.The deformation and failure characteristics of open-pit slope revealed by numerical simulation are consistent with the actual situation of the mine site,verifying the reliability of the numerical simulation results.In the process of deformation and displacement development of open-pit slope and mountain surface,there are three abrupt points,and the development of deformation and displacement is divided into four stages,which is consistent with the results of remote sensing images and on-site investigation and analysis.The research results can provide a reference for disaster prevention and control in the transition from open-pit to underground mining.
Mining engineeringGeological disasterLandslide of open-pit stopeEvolution mechanismNumerical simulation
万方数据
维普
