含透镜体的地质体真三维建模算法

Algorithm for true-3Dmodeling of geo-body including lenticular-body

针对该类复杂地质体真三维建模算法的稀少性,基于体元建模的思想,提出了一种能够恰当表达含透镜体的地层真三维模型—VGTP体元模型。给出了基于VGTP、多面体和TEN的复杂地质体三维整体建模算法;针对VGTP中包含透镜体的情况,设计了一种基于约束面的VGTP剖分成四面体的直接生长算法,把剔除透镜体空间后剩余的不规则地层空间直接剖分成四面体,同时把透镜体也剖分成结构一致的四面体。算法过程中较少用户干预,有着较高的自动化水平,为研究矿山复杂地质体的构造提供了坚实的技术基础。

Due to the shortage of algorithms for true-3D modeling of this kind of problem, following the idea of volume mode- ling. A 3D model named VGTP is presented, which can exactly express geo-bodies containing lentieular-body. A new algorithm for unified 3D modeling of complex geo-body based on VGTP, polyhedron and TEN is put forward~ aiming at VGTPs involving lenticular bodies, a new direct tetrahedral growing algorithm based on constrained boundary faces is created, which can directly split a VGTP containing inner holes to tetrahedrons after the space occupied by lenticular-body is excavated from the VGTP. Meanwhile, a lenticular body is also divided into tetrahedrons. During the entire modeling, little intervention is needed, there- fore the automation level is higher, so a stable technique base is provided for the study on the structure of complex geo-body.