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Tunnelling options in long drives: metodval vid långa tunnlar
2005 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In a Swedish study by Nord, G. and Stille, H. 1988 the authors tried to compare the methods: boring and drilling and blasting. In this thesis, an evaluation of sixteen years of development will try to compare the methods again to see if Nord and Stille’s conclusion remains reliable. Two modern tunnelling projects were studied to see where focus lay when choosing the driving method. In the two Swiss transalpine tunnels The Lötschberg- and the Gotthard base tunnels the demand on effective driving is significant. Effective driving methods are a must to ensure a good all-over project economy. The goal of this thesis was to investigate if there is a definitive answer to the question: Which factors influence the choice of tunnelling method in the Lötschberg Base Tunnel? The Lötschberg tunnel is used as a case study in this thesis and from that, the result is then compared to Nord and Stille’s study made 1988. The result of this study shows that striving for high advance rates is the main purpose to ensure predicted and an early completion of the construction. Five key areas were identified as influent on the choice of tunnelling method. Nord and Stille’s conclusion remain, it is still hard to give a definitive answer to the question of superior tunnelling method. The constant development is stimulated by competition. The TBM serve as a competitor to the drilling and blasting operation where it is applied. Very high advance rates have been recorded with the conventional method in geologies that are not considered optimal from a drilling and blasting point of view.

Place, publisher, year, edition, pages
Keyword [en]
Technology, TBM, tunnels, tunnelling, boring, drilling, blasting
Keyword [sv]
URN: urn:nbn:se:ltu:diva-47681ISRN: LTU-EX--05/219--SELocal ID: 531ffe0f-17a4-48d1-ac12-d0f4baa70012OAI: diva2:1021009
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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