<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The Tunnel Contour Quality Index (TCI) is an index established by Kim and Bruland for an effective management of a tunnel contour quality. It is estimated on a basis of measurements of two contour profiles within a single blasting round, using a laser profiler. However, the representativeness of measurement results obtained that way for the assessment of a contour quality of the entire blasting round is disputable. Terrestrial laser scanning (TLS) technology, combined with available numerical surface modeling tools, enables development of three-dimensional models of a monitored surface. The article reports results of TCI calculations based on TLS data. The presented TLS technique is based not only on selected cross-sections of the tunnel contour but also on the description of the morphology of the tunnel contour surface. The case study concerns measurements of the “Mały Luboń” tunnel niche, located in Naprawa, Poland. The TCI values for three blasting rounds were determined in accordance with Kim and Bruland's guidelines and were compared to TCI values determined with the proposed TLS technique. On a basis of this comparison, it can be concluded that the results obtained with the TLS technique are more reliable and representative for description of the contour quality of the entire blasting round than results obtained with the laser profiling technique.</p>
</abstract>

The Tunnel Contour Quality Index (TCI) is an index established by Kim and Bruland for an effective management of a tunnel contour quality. It is estimated on a basis of measurements of two contour profiles within a single blasting round, using a laser profiler. However, the representativeness of measurement results obtained that way for the assessment of a contour quality of the entire blasting round is disputable. Terrestrial laser scanning (TLS) technology, combined with available numerical surface modeling tools, enables development of three-dimensional models of a monitored surface. The article reports results of TCI calculations based on TLS data. The presented TLS technique is based not only on selected cross-sections of the tunnel contour but also on the description of the morphology of the tunnel contour surface. The case study concerns measurements of the “Mały Luboń” tunnel niche, located in Naprawa, Poland. The TCI values for three blasting rounds were determined in accordance with Kim and Bruland's guidelines and were compared to TCI values determined with the proposed TLS technique. On a basis of this comparison, it can be concluded that the results obtained with the TLS technique are more reliable and representative for description of the contour quality of the entire blasting round than results obtained with the laser profiling technique.

Evaluation of Tunnel Contour Quality Index on the Basis of Terrestrial Laser Scanning Data

Faculty of Mining Surveying and Environmental Engineering

Studia Geotechnica et Mechanica

This work is licensed under the Creative Commons Attribution 4.0 International License.

The Tunnel Contour Quality Index (TCI) is an index established by Kim and Bruland for an effective management of a tunnel contour quality. It is estimated on a...

Evaluation of Tunnel Contour Quality Index on the Basis of Terrestrial Laser Scanning Data

Article Category: Original Study

Published Online: Sep 30, 2021

Page range: 255 - 269

Received: Mar 26, 2021

Accepted: May 13, 2021

DOI: https://doi.org/10.2478/sgem-2021-0013

Keywords
TCI, Tunnel, Contour quality, Terrestrial laser scanning (TLS), Overbreak, Contour roughness

© 2021 Piotr Dybeł et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Evaluation of Tunnel Contour Quality Index on the Basis of Terrestrial Laser Scanning Data

Article Category: Original Study

Published Online: Sep 30, 2021

Page range: 255 - 269

Received: Mar 26, 2021

Accepted: May 13, 2021

DOI: https://doi.org/10.2478/sgem-2021-0013

KeywordsTCI, Tunnel, Contour quality, Terrestrial laser scanning (TLS), Overbreak, Contour roughness

© 2021 Piotr Dybeł et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
TCI, Tunnel, Contour quality, Terrestrial laser scanning (TLS), Overbreak, Contour roughness