Accurate and Swift Approach to As-Built Mapping in TBM-Excavated Tunnels
Publication: Journal of Surveying Engineering
Volume 142, Issue 4
Abstract
This paper offers a new method for mapping as-built tunnels excavated by tunnel-boring machines (TBMs) that is conveniently applicable and cost-effective. The presented procedure can algorithmically be explained as follows: (1) surveying some points on the edge of each segment using a reflectorless total station in an arbitrarily initial coordinate system, (2) shifting the measured coordinates to a location as close as the origin of the initial frame, (3) fitting a plane to the shifted coordinates of the measuring points, (4) deriving the direction angles between the normal vector and the axes of the coordinate system, (5) rotating the shifted coordinates around the third and first axes of the frame, (6) fitting a circle to the transformed coordinates to determine the position of its origin, and (7) transforming the derived coordinates of the circle origin into the initial coordinate system. The capability and reliability of the method have been indicated by means of simulated data sets. The method has also been applied to the survey measurements in excavating Line 7 of the Tehran metro network by TBM. The results affirm the proficiency of the proposed method to scan as-built tunnels.
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Acknowledgments
The authors express their gratitude to anonymous reviewers for their constructive comments and suggested corrections.
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Information
Published In
Journal of Surveying Engineering
Volume 142 • Issue 4 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Oct 20, 2014
Accepted: Jan 14, 2016
Published online: Mar 10, 2016
Discussion open until: Aug 10, 2016
Published in print: Nov 1, 2016
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