基于地层线的三维地质剖切算法

3D sectioning algorithm of geology based on stratum line

文章以地质钻孔为离散点,运用空间插值以及由曲面拟合得到的各地质结构趋势面,建立了工程地质三棱柱结构模型,在此模型基础上提出一种任意切面的剖切方法。该方法首先应用三维空间求交算法快速求出剖切面与凹凸起伏的地层趋势面的交点;然后将这些交点按照地层层序连接成三角形并根据其贯穿的地层属性进行精确着色,从而得到三维的剖切实体图、切面图,为地质工作者在3D空间中观察地质结构、分析地质特征提供了新的方法和手段,可为地质工程项目的设计、管理和施工提供科学的决策依据。

Three-prism structure model of engineering geology is built by taking geological drillings as discrete points and applying each trend surface of geological structures, which are calculated by the spatial interpolation and surface fitting algorithm. On this basis, a sectioning method of arbitrary cut- ting is proposed. First the 3D space intersection algorithm is used to quickly calculate the intersections of cutting plane and rugged trend surface, and then in terms of stratigraphic sequence these intersec- tions create triangles, which are colored accurately according to cross-cutting strata properties. As a result, the entity diagram and section diagram of 3D cutting are obtained, which can give new means for geologists when they observe geological structures and analyze geological features in 3D space, thus providing a scientific basis for the decision-making of the design, management and construction of geological projects.