基于GTP的三维地质模型空间剖切方法研究

  本文关键词：基于虚拟钻孔的工程地质三维剖切的实现，由笔耕文化传播整理发布。

（3）复合剖切并不是指简单的多次剖切，其实质是空间分析从“体-面”运算向“体-体”运算的一种转化。实验结果证明，这种方式从模拟效果和运行速度上都是满足要求的，可见通过组合多次二维运算来实现三维运算，是三维空间分析的一种有效思路。 参考文献

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Research on cutting method for 3D geological model based

on GTP

MA Jun-ting, CHEN Suo-zhong, HE Zhi-chao, DAI Jing-hui,

(Key Laboratory of Virtual Geographical Environment，Ministry of Education，Nanjing Normal University ，Nanjing ，210023，China) Abstract: Generalized three prism (GTP) is a kind of important 3D geological modeling spatial data model. In recent years, with the development of computer visualization technology, GTP geological model construction method based on drilling data is getting mature. However, the research on the 3-D profile cutting method of GTP spatial data model is still focusing on the single plane cutting section, lacking mature algorithms to support the single GTP model multiple efficient arbitrary plane section. Research on GTP model multiple cutting method, is one of the most important requirements of the 3D geological model application in practice at the same time, multiple GTP cutting method can also provide fast and efficient technical support for

the spatial operations of GTP model and 3D geometric entities. In the light of the current generalized three prism (GTP) cutting algorithm problems, which are: not suitable for deviate borehole data; by dimension reduction method or tetrahedral mesh generating method, would led to excessive data redundancy and low algorithm efficiency; unable to realize multiple arbitrary cutting operation, could not support more complicated spatial analyses of geological model. This article proposes an improved dynamic tetrahedral mesh generating method to reduce the data redundancy; by restructure the retained polyhedron after cutting operation based on topological spatial relations, the multiple arbitrary cutting problems was solved; several "plane-body" form single cutting operations were combined into one "body-body" form composite cutting operations, to realize the 3D geological model space analyses. This paper focuses on multiple arbitrary cutting plane section problem of the GTP body, based on the analysis of the GTP body element characteristics, proposed a solution, which aims to make up for the deficiency of the research on the arbitrary, multiple cutting plane section of GTP body element in the field of three-dimensional geological modeling. Application examples show that: the above three points improved GTP cutting operation speed, and are able to realize complicated spatial analyses such as space excavation, tunneling simulation and so on more efficiently.

Keywords: generalized tri-prism; tetrahedral mesh generating; composite cutting; spatial analyses

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  本文关键词：基于虚拟钻孔的工程地质三维剖切的实现，由笔耕文化传播整理发布。