Modelling Three-Dimensions Stratum And Studing On Visualization Methods

Three-dimensional geosciences modeling depicts the structure of the underground geologic bodies the shape of single layer and the complicated geologic construction, and it shows the true shape and construction of the stratum by graphical methods so as to provide exact and intuitionstic model of the geologic construction, so it is the important approach to understand the geologic construction accurately, and it provides scientific foundation for the description of the coal mine resources. This paper constructs the 3D stratum model of the coal mine' s main coal cutting distinct based on the information of seam floor contour line and geologic bar graph. On this basis, it puts forward the complete cut and multi-flats cut methods of the 3D model, and presents corresponding especial interpolation treatments for the especial geologic construction with faultage and fold based on multiple quadratic function. Meanwhile, it gives the algorithms of representing the fold and modeling. As for the modeling of the terrane with fold, if there does not exist overlapped fold on the Z order, the triangulation to reconstruct the curved surface; otherwise, in order to ensure that each single-value curved surface of fold be intersectantly connected by mistake, we give two appended constraint conditions. Each overlapped sub-distinct should be determined firstly, and then determine each single-value curved surface and its tie point, then interpolate each of them, at last, reconstruct the structure of the fold using triangulation on the basis of judgment of triangulation and the method of determining the topological relation between two points based on the two constraint conditions presented in this paper.