期刊
COMPUTERS & GEOSCIENCES
卷 109, 期 -, 页码 149-161出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cageo.2017.08.013
关键词
Rock mass; Block size; Discontinuity orientation; Automatic extraction; 3D point clouds
资金
- National Natural Science Foundation of China [51179137]
- Natural Basic Research Program of China (973 Program) [2011CB013506]
- China Scholarship Council (CSC)
- National Science Foundation of the United States [1332765]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1332765] Funding Source: National Science Foundation
This paper presents a new method for extracting blocks and calculating block size automatically from rock surface 3D point clouds. Block size is an important rock mass characteristic and forms the basis for several rock mass classification schemes. The proposed method consists of four steps: 1) the automatic extraction of discontinuities using an improved Ransac Shape Detection method, 2) the calculation of discontinuity intersections based on plane geometry, 3) the extraction of block candidates based on three discontinuities intersecting one another to form corners, and 4) the identification of true blocks using an improved Floodfill algorithm. The calculated block sizes were compared with manual measurements in two case studies, one with fabricated cardboard blocks and the other from an actual rock mass outcrop. The results demonstrate that the proposed method is accurate and overcomes the inaccuracies, safety hazards, and biases of traditional techniques.
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