期刊
ENGINEERING GEOLOGY
卷 242, 期 -, 页码 44-54出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.enggeo.2018.05.007
关键词
Rock discontinuities; Geometric properties; Automated measurement; Point cloud; Modified region growing
资金
- National Key R&D Program of China [2017YFC1501303]
- National Natural Science Foundation of China [41602316]
- Open Project of Key Laboratory of Earth Fissures Geological Disaster, Ministry of Land and Resources [201601]
An approach was proposed to automatically measure the discontinuity geometric properties from a point cloud acquired using Light Detection and Ranging (LiDAR). The procedure primarily includes the following features: (Assali et al., 2016) Grid data from the point cloud was created to enhance computational efficiency for data processing and retrieval; (Barton & Choubey, 1977) A modified region growing (MRG) algorithm, which is characterized by more efficient grow criterion, was used to recognize discontinuities from the point cloud; (Cao et al., 2017) Four geometric properties from identified discontinuities were calculated based on analytic geometry; (Chen et al., 2016) Influence of threshold T on the identified results was investigated through sensitivity analysis, and threshold T was suggested to be less than the minimum normal difference among all joints and larger than 0 degrees. Two cases (regular polyhedrons and a tunnel in the Rumei hydropower station) were taken as case studies to validate the developed approach, and calculation results have good agreement with real situations.
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