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为研究含无煤区和断层的煤层三维模型的自动构建方法,基于钻孔数据和二维煤层边界线及断煤交线,利用见煤钻孔与煤层顶、底板交点和插值得到的未见煤钻孔点,构建Voronoi图,确定未见煤钻孔的影响区域为无煤区边界线;通过钻孔与煤层顶、底板的交点,对煤层边界线、断煤交线、无煤区边界线上点和煤层顶、底板面上网格点的高程值进行插值;从两个方面对用于高程插值的距离反比加权插值方法进行改进,采用四分圆扇区搜索和钻孔工程数量优化邻近样本点,通过计算插值点和样本点连线与断煤交线的交点数量排除位于断层异侧的样本点;对已插值的内外边界线和网格点进行约束Delaunay三角剖分,分别建立煤层顶、底板表面;对逆断层的重叠区域按上、下盘分别进行断煤交线和网格点的高程插值以及表面建模,最终形成煤层三维模型.
In order to study the automatic construction method of coal seam three-dimensional model with coal-free zone and fault, based on the data of borehole, the boundary line of two-dimensional coal seam and the intersection of coal cut, Voronoi diagram was constructed to determine the influence zone of the unobserved coal borehole is the boundary line of the coal-free zone. The boundary line between the coal seam and the coal seam, Line points and the elevation of the grid points on the top and bottom of coal seam are interpolated. The distance inverse proportion weighted interpolation method used for elevation interpolation is improved from two aspects, and the number of quaternary circular sector search and drilling project is used to optimize the neighborhood The sample points are excluded from the sample points located on the opposite side of the fault by calculating the number of intersection points between the connection point of the interpolation points and the sample points and the cut off line. Constrained Delaunay triangulation of the interpolated boundary lines and grid points are used to establish the coal seam Top and bottom surface. The overlapping area of the thrust fault is divided into upper fault and lower fault by interpolation of the cut-off lines, elevation interpolation of the grid points and surface modeling, finally forming a three-dimensional model of coal seam.