Evaluation of surface roughness of rock-like joints using close range photogrammetry method

Amir Hossein Momeni, Masoud Torkan*, Amin Azhari, Lauri Uotinen, Alireza Baghbanan

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

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Abstract

The surface roughness of the joints affects their hydraulic and mechanical behavior. There are various methods for assessing the surface roughness of discontinuities. With the development of photography technology and the release of powerful software, a photogrammetric analyzer has been introduced as a non-contact surface evaluation method. In this research, a three-dimensional model of the fracture surface was constructed using the
close-range photogrammetric procedure and the joint roughness coefficient (JRC) is derived from the surface profiles. Also, the surface profiles were surveyed using the Profilometers (Barton Comb) and the JRC values were obtained using the Z2 method. Calculations were performed in two sampling steps of 0.42 and 1.27 mm. Ultimately, the results of the two methods were compared. A Sony Cybershot HX1 digital camera was used to capture the
images. To process the images and build the 3D model, they were loaded in the "Agisoft metashape" software. A point cloud data was obtained with very high accuracy with a distance of 0.13 mm between points in the 3D model. The results show that the JRC values obtained from the photogrammetry method, for the upper surface of the joint, recorded 8% and 11% difference from the joint surface for sampling intervals of 1.27 and 0.42 mm, respectively. While for the bottom surface of the joint, these differences were 6.1% and 10% for sampling intervals of 1.27 and 0.42 mm, respectively.
Original languageEnglish
Article number012062
Number of pages8
JournalIOP Conference Series: Earth and Environmental Science
Volume1124
Issue number1
DOIs
Publication statusPublished - 10 Jan 2023
MoE publication typeA4 Conference publication
EventISRM European Rock Mechanics Symposium: Rock and Fracture Mechanics in Rock Engineering and Mining: Rock and Fracture Mechanics in Rock Engineering and Mining - Dipoli, Otakaari 24, Espoo, Finland
Duration: 11 Sept 202215 Sept 2022
https://www.ril.fi/en/events/eurock-2022.html

Keywords

  • close-range photogrammetry
  • roughness
  • 3D point cloud
  • image processing
  • Z2 parameter

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