| Landslides are the most common form of disaster in opencast mines,seriously affecting the safety of life and property of mine workers.Landslides are caused by many factors.If these data can be integrated and utilised,on the one hand,the "information silo" phenomenon in open pit mines can be effectively solved;on the other hand,landslide data can be integrated and analysed to effectively predict landslide areas and risk areas.In addition to the above influence factors,which can be obtained from the geological production data of the opencast mine,the data can be extracted by using the spatial analysis of the Geographic Information System(GIS)itself,and the data collected can be used to build a visualisation model for the fusion of multiple information and to carry out a predictive analysis of the influence factors affecting slope instability.The results of the analysis are integrated into the multivariate information model.In this paper,the surface model is constructed based on inclined photogrammetry,the geological production data of the open pit is collected and the data is published.The historical landslide analysis of the Dagushan open pit is carried out by two different means and the data is integrated into a 3D visualisation platform based on OpenGL technology.The specific work in this paper is as follows.(1)UAV tilt photogrammetry of the Dagushan open pit mine to obtain a high accuracy mine tilt photographic model and construct a surface model of the open pit mine based on the tilt photographic model.This will provide data basis and model support for subsequent landslide analysis and platform construction(2)Based on the GIS spatial analysis function and existing data,extract and establish a statistical model containing six factors:slope,slope direction,slope shape,elevation,fault and lithology.The extracted digital elevation model(DEM)of the open pit mine was statistically analysed based on the weighted information quantity method.(3)A geological model of the open pit was constructed using the final realm map and profile map of the mine,and a numerical simulation of the discounted intensity of the open pit was carried out based on the geological model and the discounted intensity theory.The landslide risk areas derived based on the weighted information quantity method were compared with the results obtained from the field inspection areas and numerical simulation results for verification.(4)Model conversion using GIS to convert the inclined photographic model to DEM and high accuracy orthophotography(DSM)of the pit surface.The platform is integrated using existing mine data such as:geological models,final realm maps,monitoring point data and geological reports as well as the landslide risk map of the open pit and the stress field,damage field and strain field of the open pit obtained using the two methods in this paper,making the platform equipped with monitoring,simulation and multiple data functions. |
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