基于TIN的露天矿区地形精细模型构建研究

准确构建露天矿区三维地形模型,客观反映露天矿在开采过程中的地形动态变化特征,对于提高露天矿生产管理效率和信息化水平具有重要意义。根据露天矿地形特点,提出了以凸壳算法为基础的建模方法。该方法中,以空间特征为约束条件构建三维地形精细模型。以三维地形精细模型为基准,针对地理信息软件ArcGIS中三维体积计算的局限性,提出了一种土方量计算的改进算法。以宝日希勒露天矿为例,结合矿区地形碎部点测绘数据,进行了三维地形精细模型构建。研究表明:该建模方法提升了三维地形模型的构建效率,同时以边为着眼点对三维地形模型进行优化,提高了模型的几何精度。通过对比分析不同时期露天矿三维地形模型的体积变化和形状变化情况,可为露天矿开采动态量化评估提供可靠依据。

Study on the Construction of Fine Open-pit Mine Terrain Model Based on TIN

Accurately constructing the three-dimensional terrain of the open-pit mine and objectively reflecting the dynamic characteristics of the open-pit mine during the mining process are great significance for improving the efficiency and information level of the open-pit mine production management.According to the characteristics of the open-pit mine terrain，an improved modeling method was proposed based on the convex hell algorithm.In this method，the three-dimensional terrain fine model was optimized by using spatial features as constraints.Based on the three-dimensional terrain fine model，this article further proposed an improved algorithm for earthwork calculation against the limitation of three-dimensional volume calculation in geographic information software ArcGIS.Taking Baojixier open-pit mine as the experimental area，according to the the survey data of the topographical parts，the 3D terrain fine model construction verification experiment was carried out.The experimental results show that the modeling method can improve the construction efficiency of the 3D terrain model， and optimize the 3D terrain model with the edge as the focus which improves the geometric accuracy of the model.By comparing and analyzing the volume change and shape change of the three-dimensional terrain model of open-pit mine in different periods，it provides a basis for quantitative evaluation of open-pit mine mining situation.