Journal of Geo-information Science >
Research on Cutting Method for 3D Geological Model Based on GTP
Received date: 2014-05-26
Request revised date: 2014-06-16
Online published: 2015-02-10
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Generalized three prism (GTP) is an important 3D spatial data model which is widely used for geological modeling. In recent years, with the development of computer visualization technology, GTP geological model construction method based on drilling data is maturing. However, the research on the 3-D profile cutting algorithm of GTP spatial data model still focuses on the single plane cutting section, and lacks mature algorithms to support the multiple efficient arbitrary plane section of single GTP model. Research on multiple cutting method of GTP model is one of the most important requirements of the 3D geological model applications in practice; at the same time, multiple GTP cutting algorithm can also provide efficient technical support for the spatial operations of GTP model and 3D geometric entities. The current generalized three prism (GTP) cutting algorithms are not suitable for dealing deviate borehole data with dimension reduction method or tetrahedral mesh generating method, and would lead to excessive data redundancy and low algorithm efficiency. In addition, it is unable to realize multiple arbitrary cutting operations, and could not support the more complicated spatial analyses of geological model. This article proposed an improved dynamic tetrahedral mesh generating method to reduce the data redundancy by restructuring the retained polyhedron, which is constructed after cutting operation, based on topological spatial relations. The multiple arbitrary cutting problems were solved and several "plane-body" single cutting operations were combined into a single "body-body" composite cutting operations to realize the 3D geological model space analyses. This paper focused on multiple arbitrary cutting plane section problems of the GTP body based on the analysis of the GTP body element characteristics, proposed a solution which aims to make up the deficiencies of the research on the arbitrary and in multiple cutting plane section of GTP body element in the field of three-dimensional geological modeling. Application examples show that: the above three points could improved GTP cutting operation speed and are able to realize complicated spatial analyses such as space excavation and tunneling simulation more efficiently.
MA Junting , CHEN Suozhong , HE Zhichao , DAI Jinghui . Research on Cutting Method for 3D Geological Model Based on GTP[J]. Journal of Geo-information Science, 2015 , 17(2) : 153 -159 . DOI: 10.3724/SP.J.1047.2015.00153
Fig. 1 GTP restructure based on morphology after cutting operation图1 基于形态特征的GTP剖切后重组方式 |
Fig. 2 GTP whole cutting patterns and restructures based on topological relations图2 GTP完全剖切类型及其拓扑关系的重组方式 |
Fig. 3 Cutting algorithm for geological model based on GTP图3 基于GTP的地质模型剖切算法总体流程 |
Fig. 4 Underground tunnel model structure图4 地下巷道模型结构 |
Fig. 5 Spatial analyses of geological model based on GTP图5 基于GTP的地质模型的空间分析操作 |
The authors have declared that no competing interests exist.
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