TY - JOUR N2 - In drill and blast tunneling method (D&B), non-electric detonators are the most commonly used initiation system. The constant development of excavation technology provides advanced tools for achieving better results of excavation. The research presented in this paper was focused on the attempt to evaluate the influence of electronic detonators, which nowadays are unconventional in tunnelling engineering, on the quality of the excavated tunnel contour. Based on the data form Bjørnegård tunnel in Sandvika, where electronic detonators were tested in five blasting rounds, detailed analysis of drilling was performed. The analysis was made based on the data from laser scanning of the tunnel. 103 profile scans were used for the analysis: 68 from non-electric detonators and 35 from electronic detonators rounds. The results analyzed in terms of contour quality showed that comparing to the results from rounds blasted with non-electric detonators, there was not significant improvement of the contour quality in rounds with electronic detonators. L1 - http://journals.pan.pl/Content/120646/20_ACE-00231_A4.pdf L2 - http://journals.pan.pl/Content/120646 PY - 2021 IS - No 3 EP - 349 DO - 10.24425/ace.2021.138059 KW - Drill&blast method KW - contour quality KW - scanning KW - electronic detonators A1 - Skłodowska, Anna Monika A1 - Mitew-Czajewska, Monika PB - WARSAW UNIVERSITY OF TECHNOLOGY FACULTY OF CIVIL ENGINEERING and COMMITTEE FOR CIVIL ENGINEERING POLISH ACADEMY OF SCIENCES VL - vol. 67 DA - 2021.09.08 T1 - The influence of electronic detonators on the quality of the tunnel excavation SP - 333 UR - http://journals.pan.pl/dlibra/publication/edition/120646 T2 - Archives of Civil Engineering ER -