Study On Uncertainty Of Spatial Model In Open-pit Mine

With the development of digital mine technology,three-dimensional spatial model has been widely used in the production and design of the mine.The uncertainty of 3D spatial deposit model has an important influence on whether the decision of mine production is correct or not.Therefore,it is the key to the scientific evaluation of the decision making based on the uncertainty analysis of the spatial deposit model and itself.On the base of the analysis of uncertainty theory,the uncertainty of spatial data of open pit mine is analyzed,and the propagation of spatial data sources and uncertain spatial data in the open pit mine is investigated,as well as the location and attribute of the uncertainty of spatial data has been studied.The optimal modeling precision and interpolation accuracy has been revealed.The uncertainty model of coal seam floor interface and its thickness,as well as its correlation,have been defined in open pit coal mine.The uncertain model of mine 3D spatial on Huolinhe north open pit mine has been constructed.The uncertainty description of the spatial model of open pit mine has been realized and applied to the north open pit mine.By the analysis of the source and its uncertainty of the spatial data in the open pit mine,it shows that the spatial data can be divided into the original data,results data and production data according to the different spatial data stages,which has scientific basis and practical value.According to the study results of different interpolation method accuracy of the bored original data in the north open pit mine,it shows that Kriging interpolation accuracy is the highest,obviously better than the inverse distance weighed method and polynomial interpolation.On base of the uncertainty of the original data and the modeling method,the uncertain mathematical model of north open pit mine space model based on the irregular tetrahedral has been built up.The uncertainty model of the coal seam floor and the thickness was constructed firstly,and the standard deviation of each node could be obtained.The uncertainty could be described by the relative error of each node.Applying the principle of error superposition,the uncertainty could be effectively synthesized by the uncertainty model of the interface of the coal seam floor and the coal seam thickness to construct the uncertain model of the coal seam.The spatial uncertainty model of the whole deposit has been accomplished though the uncertainty of synthetic superimpose between different coal seams and rocks.The uncertain model is successfully applied to the planning in Huolinhe north open pit mine,and it should be used to guide the actual production and long-term planning in the open pit mine.