Research On Integrated Geological Survey And Mining Information System Of 3D Visualization

Concerning the defects which exit in the current development and applications of geological survey and mining information system, the paper succeed in introducing the visualization and integrated thoughts into the researches and developments of geological survey and mining information system, in the light of the actual needs of mine. Moreover, the paper has conducted a further research for the basic problems and key technologies of visual geological survey and mining information system, via the applications of computer graphics theory, geological and mineral 3D modeling theory, MIS system development theory,3D visualization technology, intelligent recognition technology and the OpenGL technology.The research status and prime problems of current geological survey and mining information system were analyzed in the paper. In the light of the actual needs of mine, the paper studied the general data flow in the mining geological survey, and proposed an integrated solution for the 3D visual geological survey and mining information system. According to the principle of function decomposition, the total system is divided into three modules, such as the basic information platform, the integrated search platform and the graphics processing platform which interact one another via database and interface programs.Combined with the data acquisition and processing path in the mining geological survey, a set of geological survey and management system was developed based on C/B/S mixed mode using the MIS system development theory, object-oriented analysis and design method, component technology, database technology, distributed applications system structure and WebServices technology. The system enables the reasonable organization and an effective management of the geological survey data, also provides a foundation for the mining production, planning and decision, meanwhile, supplies the basic data for the graphics processing system.Through the research on the 3D digitization of 2D geologic logging datum, the roadway automatic mapping algorithm and vein logging digital algorithm were established based on the survey data taken underground. Directed towards the vacancy application of geologic logging digital software interiorly, a set of geologic logging intelligent analysis system was invented using computer graphics theory, intelligent recognition technology and traverse positioning technology based on the CAD technology realized by C#.NET, and enables roadway geologic logging data to be digital and mapped-automatic.On the basis of analyzed the limitation of 3D modeling method in traditional geological and mineral engineering, studied the design problems of geological and mineral data models, also the data structures, a rapid construction method of complex geological and mineral engineering 3D model of large-scale mine was proposed in the real 3D environment. In the aspect of terrain modeling, the surface interpolation algorithm was introduced based on fractal dimension. With above, the paper put forward the terrain isoline generation algorithm based on improved midpoint displacement method combined rectangular grid method, and presented the construction method of delaunay sub-triangulation network based on the triangulation growth method and simplified technology of terrain models. There was an effective research on the roadway generation algorithm of loading section of roadway on centerline in the paper, which introduced the dissection connection method of roadway roof and floor surface model, and proposed a new 3D modeling method of underground development projects, which related the combination with the synthesis of roadway roof and floor, and loading section of roadway on centerline. Through careful analysis, a method of lithology modeling was presented by computer combined with experience explain and a general estimate process of lithology modeling was brought forward. A construction method of mining surface models and the way ore body closes were proposed, based on the drilling exploration profiles. In view of drilling profile circle even ore body being not adaptable to the thin or the extremely thin veins, the paper proposed to delineate the ore body profiles according to level vein, and adopted the digital vein plan or level geology drawn, for the purpose of connecting the solid models. In order to reduce the data amount of geological block model and improve the speed and accuracy of modeling, a block model was used to subdivide the target area based on octree. An algorithm of the intersection test between octree and oriented bounding box (OBB) tree was given to improve the speed of modeling.Aimed at the limitation of the traditional method of calculating reserves, the Kriging spatial interpolation and extrapolation methods were carefully studied in the paper. In order to eliminate the unstable factors of the method of traditional experimental variograms calculation, and to introduce stable statistics into the calculation of variograms, a kind of effective and stable 3D Kriging method was proposed. Moreover, it also presented the fitting algorithm of variograms and the cross-validation method of the parameters of variograms.The research has developed a set of Mining 3D Modeling System based on OpenGL visual development technology, which enables the functions such as data analysis and management,3D modeling, reserves calculation and management, graphics auxiliary operation and so on. In the paper, an interface procedure was compiled among the geological survey information management system, the geologic logging intelligent analysis system and the Mining 3D Modeling System, which realised the "one-off acquisition of geological survey datum, real-time sharing of information transmission, automatic generation of geological survey graphics,3D visualization modeling" in an integrative way. Used in the mine practically,3D solid models for the geological and mining engineering were established in a certain large-scale gold mine, which realised 3D visual display, such as the models of terrain, drilling, level roadway, development system, orebody and so on. The deposit modeling has been practiced in a certain iron mine, with it, the paper established lithology and orebody models based on the statistical analysis and composition of samples. By analyzed variograms, the paper established grade model of iron and estimated the reserve, the calculating results were consistent to the data provided by the geological exploration report.