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Figure 1:
Visualization of the entrance to the underground track “St. Johannes” Mine in Krobica (Kobylańska, 2012).
Figure 2:
Location of the scanned 7.5-m fragment of the adit on the underground track “St. Johannes” Mine in Krobica. In the vicinity of the measurement site, there is a shaft connecting both adits (St. Leopold below and St John above).
Figure 3:
Trimble TX8 laser scanner during measurements in the St. John adit.
Figure 4:
The intensity of the laser beam reflection in the adit (the black spot is a fragment of the sidewall closer than 60 cm from the scanner).
Figure 5:
“Point cloud” visualization of a fragment of the St. John adit, displayed by the value of the reflection intensity parameter.
Figure 6:
(a–c) Generating 2D cross sections from (a) “point cloud” in CloudCompare software and (d, e) dimensioning of a selected characteristic cross section.
Figure 7:
(a, b) Creating the cross sectional geometry of the scanned fragment of the adit and (c, d) its discretization in FLAC 3D Itasca v.9.0 software, sketch option.
Figure 8:
Geometry obtained for the quasi-3D numerical model of the underground excavation in the FLAC 3D Itasca v.9.0 program.