基于钻孔数据的矿体三维可视化研究与实现

Study and implementation of borehole data based 3D visualization of ore body

建立矿体三维可视化模型是数字化矿山的重要内容,对矿山生产、地质分析有着十分重要的作用.提出了基于钻孔数据的断面-不规则三角网-广义三棱柱(Section-Triangle Irregular Net-Generalized Tri-Prism,Section-TIN-GTP)混合矿体建模方法,该模型既可以用TIN表示矿体的表面模型,又可以用GTP表示矿体的内部实体结构;利用边界轮廓控制点的对称性,提出了基于领域知识的由剖面轮廓构建三维模型的快速算法;并设计实现了矿体三维建模系统,该系统通过自动绘制和交互式修改勘探线剖面图将专家的知识经验融入实际的矿体建模中,提高了矿体建模的精度;最后利用该系统展示了一个实际矿体的三维可视化模型.

3D visual modeling of an ore body is one of key issues in digital mine construction. It can play important roles in mine production and geological analysis. The paper presents a Section-TIN-GTP（Section- Triangle Irregular Net-Generalized Tri-Prism）mixed modeling method of an ore body bas.ed on borehole data. The model can employ TIN to describe the surface of an ore body, and use GTP to present the internal solid structure of the ore body. A fast algorithm for building 3D ore body model from the sectional contours based on domain knowledge are proposed. The algorithm is based on the symmetry property of the control points on the sectional contours of an ore body. 3D modeling system for an ore body is designed and implemented. The system employs expert＇s domain knowledge by combining automatic drawing and interactive modifying sectional charts to improve the precision of the model. Finally, shows the 3D visual model of a real ore body constructed by the modeling system.