Technology Of 3D Dynamic Modelling For Coal Seam And Its Application

The coal seam dynamic modelling is an integrated technology,referring to methodology of coal seam modelling,automatic processing algorithm and data organization and management of established model.In this paper,the concept of Generalized Straight Triangular Prism(GSTP) is presented based on analyzing coal seam geologic modeling feature and some 3D spatial modeling methods.In addition,the definition, geometry forms,spatial topology relation and data structure of GSTP are also discussed in this paper.Research result indicate both the Triangulated Irregular Network(TIN) as a facial model and the Generalized Straight Triangular Prism Network(GSTPN) as a volumetric model are suitable to coal seam 3D dynamic modelling.The features of geology information and data process flow in coal mine are analyzed,and two coal seam dynamic modelling route are designed based on the corresponding relation between plane and profile.According to the reverting process of lines of intersection between coal seam and fault,the restricted boundaries of fold,ordinary fault and reverse fault are taken as a simple restricted line.And then a new algorithm named "movement and reverting" for the automatic processing of fault in plane and profile is presented first.Base on that,a full method that develops the automatic ability for coal seam 3D dynamic modelling under the complex restricted conditions is brought forward.At last,a preliminary visual 3D model system for coal seam is established based on coal seem 3D model and using OpenGL and Vc⁺⁺6.0.Currently a part of research results has been applied to Mine Survey Geological Information System(MSGIS3.0),including constrained triangulation of coal bed suface, coal bed scaleboard contours with fault,part encrypt of contours,excellent turn of triangle,space encrypt,any direction profile of coal bed and so on.The coal seam dynamic modelling has also good foreground for production,management and professional training of coal mine,resulting in a foundation for the 3D geography information platform of coal mine.