A feature extracting and meshing approach for sheet-like structures in rocks

Liu, Yan and Xing, H. L. (2014) A feature extracting and meshing approach for sheet-like structures in rocks. Computer Methods In Applied Mechanics And Engineering, 276 396-409. doi:10.1016/j.cma.2014.03.020

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Author Liu, Yan
Xing, H. L.
Title A feature extracting and meshing approach for sheet-like structures in rocks
Journal name Computer Methods In Applied Mechanics And Engineering   Check publisher's open access policy
ISSN 0045-7825
Publication date 2014-07-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.cma.2014.03.020
Open Access Status Not yet assessed
Volume 276
Start page 396
End page 409
Total pages 14
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 2206 Computational Mechanics
2211 Mechanics of Materials
2210 Mechanical Engineering
3100 Physics and Astronomy
1706 Computer Science Applications
Abstract Meshing rock samples with sheet-like structures based their CT scanned volumetric images, is a crucial component for both visualization and numerical simulation. In rocks, fractures and veins commonly exist in the form of sheet-like objects (e.g. thin layers and distinct flat shapes), which are much smaller than the rock mass dimensions. The representations of such objects require high-resolution 3D images with a huge dataset, which are difficult and even impossible to visualize or analyze by numerical methods. Therefore, we develop a microscopic image based meshing approach to extract major sheet-like structures and then preserve their major geometric features at the macroscale. This is achieved by the following four major steps: (1) extracting major objects through extending, separation and recovering operations based on the CT scanned data/microscopic images; (2) simplifying and constructing a simplified centroidal Voronoi diagram on the extracted structures; (3) generating triangular meshes to represent the structure; (4) generating volume tetrahedron meshes constrained with the above surface mesh as the internal surfaces. Moreover, a shape similarity approach is proposed to measure and evaluate how similar the generated mesh models to the original rock samples. It is applied as criteria for further mesh generation to better describe the rock features with fewer elements. Finally, a practical CT scanned rock is taken as an application example to demonstrate the usefulness and capability of the proposed approach.
Keyword 3D image
Feature extraction
Unstructured mesh generation
Rock veins
Sheet-like structure
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP110103024
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Papers
Official 2015 Collection
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 2 times in Scopus Article | Citations
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Created: Thu, 15 May 2014, 00:15:49 EST by Dr Huilin Xing on behalf of School of Earth Sciences