E16 Sandvika-Wøyen: Analysis of tunnel excavation, achieved contour quality and influence of applied initiation system.
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The drill and blast excavation method is the most commonly used method for tunnel construction in Norway. In D&B the results from blasting can be evaluated through several factors, such as pull percentage, vibration level and contour quality. The main goal of the thesis was to analyze excavation with a special focus on the quality of the achieved contour and the influence of the applied initiation system. The analysis was performed based on results from the Bjørnegård tunnel, which was a part of the E16 Sandvika-Wøyen, Norwegian infrastructural project. Tunnel excavation analysis was done by an estimation of the drilling accuracy and measurement results from scanning. Data for the thesis was collected from one tunnel tube from twelve rounds in total: seven of which used standard non-electric detonators and five used electronic detonators. The assumption was that the use of the electronic detonators as an initiation system has the potential for better contour quality. Special accuracy of the drilling was required for the test.
Master thesis - NTNU Trondheim - Norwegian University of Science and Technology. Faculty of Engineering Science and Technology. Department of Civil and Transport Engineering.