Subject of this master thesis was the implementation of a modern geotechnical documentation realised at the construction site of the Koralmtunnel on the southern tunnel boring machine. As only a small part of the tunnel face can be inspected visually by geologists during maintenance shifts, a photographic documentation was tested, in order to get a more holistic picture. For this purpose a standard fotografic camera was installed in one of the man holes of the cutter head. The cutter head rotates 360 degrees, while the camera takes a video of the tunnel face. For post-processing of the acquired data, the MATLAB programming language was used to create a script, that compares the individual frames of the video and aligns them in order to generate an overall picture. The distance between the individual frames of the video was determinend by comparing two adjacent phase-correlated images. This method uses the fourier transformation for the calculation of the distances between the images. The resulting tunnel face image is a 65 cm wide ring at a radial distance from tunnel axis of about 3.8 m. The quality of the created images is independent of the distance from the camera to the tunnel face and the rotation direction of the cutter head. A detailed geological and geotechnical documentation of the tunnel face by a geologist is indispencable especially as the interpretation of the generated images requires expertise of geology.
|Translated title of the contribution||Geotechnical documentation of the tunnel face of a mechanised advanced tunnel by means of modern technical measurement methods|
|Award date||13 Dec 2013|
|Publication status||Published - 2013|
Bibliographical noteembargoed until 27-08-2018
- tunnel face
- face documentation
- tunnel boring machine