本文關(guān)鍵詞：基于虛擬鉆孔的工程地質(zhì)三維剖切的實現(xiàn)，由筆耕文化傳播整理發(fā)布。

（3）復(fù)合剖切并不是指簡單的多次剖切，其實質(zhì)是空間分析從“體-面”運算向“體-體”運算的一種轉(zhuǎn)化。實驗結(jié)果證明，這種方式從模擬效果和運行速度上都是滿足要求的，可見通過組合多次二維運算來實現(xiàn)三維運算，是三維空間分析的一種有效思路。 參考文獻

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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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  本文關(guān)鍵詞：基于虛擬鉆孔的工程地質(zhì)三維剖切的實現(xiàn)，由筆耕文化傳播整理發(fā)布。